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4.3L gas milage?

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Old 02-17-2003, 08:11 PM   #51
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I never let mine warm up much... 30 seconds-1 minute max. But I do idle for 20-30 minutes once I get to work... something I never do in the summer or fall. Guess I need to stop that and just go sit in the cafeteria...
Old 02-17-2003, 10:45 PM   #52
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Funny thing is....... I let my truck warm up sometimes 5 minutes, and I live in southern crapifornia... I need a timer or something that says 30 seconds. Doesn't not letting it warm up not let the oil circulate fully and causes direct metal on metal wear? I was told by my parents always to let a vehicle warm up, always.. I suppose if you drove it the day previous a little oil would be coating soem vital parts... How long does it take the oil to fully circulate through the engine?? That would be sweet juicy infromation, because that's all the time you need to let your truck warm up.
Old 02-18-2003, 12:40 PM   #53
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Does anyone know the magic oil circ time? (avg)
Old 02-18-2003, 06:36 PM   #54
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Does anyone know how to check your O2 sensors? Theyre not throwing a code but theyre very old. I think my mileage is due to a few possible things: extended warmups, iac sensor, O2 sensor, evap canister, fp regulator. Not too sure yet.
Old 02-18-2003, 09:42 PM   #55
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The manual suggests a visual inspection first. Normal deposits will be darker, abnormal will have pitting, and the picture it silver- ish. If it is white and gritty it may have an antifreeze leak. If it is brown, you have oil consumption. Anyway, you have to bring the engine to normal operating temperature, running the engine above 1200 RPM for two minutes. Backprobe (In other words, use your multimeter to check the voltage without severing any connections. This is very hard without damaging something. The easiest way is to use some connectors that will contact the wire and provide a metal surface to test with. This will harm some insulation, although it's not that bad. The hardest way is to find a male and female connector just like the one you are testing, and burn away the insulation (After bridging them from the M to F) at various points to test with your multimeter. I'm sure the easier way is somewhere in between lol. I'm poor, but personally it's easier for me just to replace them) With a single wire unit just ground one connection, and verify that the voltage fluctuates rapdily (May be hard to see with a digital MM, easier but less accurate with an analog/ needle type)between .40 and .60 volts. If the voltage is stabilized in the middle somewhere (or if ti fluctuates slowly) it's probably bad. If it stabilizes at either end of the range, the O2 cannot compensate for a more seriosu problem in the engine. For a heated sensor, it's the same thing, but you have to check for filament (heater) voltage as well as the .40-.60 voltage fluctuation. It's the same thing, but with a filament. You have to use a high impedance ohmmeter (ANY digital voltmeter pretty much, and most needle types), and check between the wires i list below, and verify the resistance is between 3.5-14.0 ohms.




Now, for reproducing this information, I simply ask you remove the engine from your truck, and find some way to gauge how long it takes the oil to completely circulate through the engine. I know, I know, I'm a great guy.



Obviously, I'm kidding, but if you want details with pictures, I suggest you purchase a manual for your S-10. Manuals should be one of the first things you buy for your truck. It will come in handy in the future, I guarantee!!!


The wires you need to test on the heated unit are tan and white, and purple and white. (Tan colored with a white stripe, and purple colored with a white stripe)
Old 02-19-2003, 08:23 PM   #56
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Hey wolfman, did you change your O2 sensor(s) out? If you did, did it help at all?
Old 02-20-2003, 10:22 AM   #57
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I get about 14 mpg. I drive mostly highway and get 240 miles per tank (18gal) S-10's get BAD gas milage.
Old 02-20-2003, 11:31 AM   #58
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Yeah I did, and also reinstalled the throttle body restrictor and cleaned the MAF. I haven't done the calcs for it yet though. They won't be good, because it rained and I got pissed off and floored it a lot (Which takes a lot of gas). I haven't replaced the post cat one just yet, I'm not sure about it.


Just did the calcs and I'm at 15.004MPG right now. MUCH better (I USED TO GET 11.9 MPG!!!), but still crappy. This is all city driving btw, though. I might replace the postcat sensor after all. They are making a difference. I have a feeling my mileage will continue to get better. Will try to get the egr mod as well. I figure the V-6 should get 25 highway at least and 18 or so city. My buddy at works has a fullsize sierra with a 305 (305 not 350) that gets 25MPG CITY!!! WTF? So, if you slap on 2 more cylinders and increase the displacement 40 some odd cubes, you get better gas mileage? HUH?

Last edited by wolfmangk; 02-20-2003 at 11:36 AM.
Old 02-21-2003, 02:30 AM   #59
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Mine is getting such crappy mileage right now. I'm running about 200 miles, if that, before I get to the orange. I think it's because I'm running so cold, like 140 degrees.
Old 02-22-2003, 12:13 PM   #60
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On my 92 4dr Blazer 4.3 CPI stock with 175k my best mileage is just a shade over 17 and around 270 miles per tank. Lots of freeway helps, but in So Cal you can idle the whole way to work on the freeway so that takes it down. Plus the gas gauges are not even close to acurate. I can still show half full at 200mi and then it dives for empty after that. Any body says they get 20+ with any 4.3 doesn't know how to figure gas mileage right. These are computer controlled and they do what what they do.
Old 02-22-2003, 04:50 PM   #61
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What do you have to do to replace an O2 sensor? Do you have to cut the wires or what? Im planning on goin to autozone tomorrow and buying some sensors and see if any of them do me any good, and if they dont, take them right back.
Old 02-22-2003, 05:29 PM   #62
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Believe it or not.

Believe it or not. On Thursday, I did my mileage and got this. 204miles and put in 9.3 gallons. That equals 21.94 mpg. That was 95% highway driving.
Old 02-22-2003, 05:30 PM   #63
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Way to go bro at least someone on this threads got something good to say about our trucks
Old 02-22-2003, 06:32 PM   #64
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My best was 22.74mpg with 269.2 miles on the tank (11.8 gallons fillup). It was all highway cruising around 70. My average is around 16.2 mpg though. But yes you can get over 20 with a 4.3.
Old 02-22-2003, 06:56 PM   #65
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Sorry i never got specific...
I get lousy gas mialge in the city. But on the highway i get good gas mileage. Although i have an imbread cold / ram air intake. (fook'd up sounding huh)
Its a K&N fpik, with pvc / rubber housing (3"). I ran the tubes under the truck (kept them hidden for most part), they lead right up to the air fliter, but not sealed. They serve little to no purpose in the city. But when doing 75mph, all the air my truck may want is being forced right into the area of my filter. And its "cold" seeing as its from low to the ground. I think its proven, to me anyways, to be a big mod for mpg. I take my 4-wheeler all over in MI, during the summer. I noticed a diff in pwr, and mpg. Not a miricale, just subtle. And it was under $15 for "ram-air" rig-job.
I M O
Old 02-23-2003, 06:30 PM   #66
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im not to sure of the xtact milege but on my xtreme i can go about 250miles on a tank of gas, its an automatic w/ a 2.2 and i can go about 400miles on a tank of gas w/ my97 S10 witch has a 5-speed 2.2
Old 03-04-2003, 10:07 AM   #67
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for a 1998 x-cab s-10 with a 4.3L V6 and 16 or so gallon tank,.. the city mileage is roughly 28 mpg and highway mileage is roughly 32 mpg.

I get about 300- 350 miles to a tank if I stay on the highway and actually use my engine like it was ment to be used (wide open),...which I do most of the time I drive.
Old 03-04-2003, 11:21 AM   #68
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All my driving is city. I just put on a magnaflow muffler on my truck a few days ago. LAST ESTIMATE IS AT EXACTLY 16 MPG. Not THAT bad! Better than 11.9! I do NOT use the gas gauge. I use my Axim to jot down my mileage and exactly how much gas I put in the tank, subtract mileage and divide by gallons. I reset the comp last night for the muffler change, so I will see what i get after that. I STILL need to replace the O2 sensor post cat.



Can anyone else suggest some fuel economy increasing mods?

Fuel pressure regulator, anything... What do they cost?

Last edited by wolfmangk; 03-04-2003 at 11:25 AM.
Old 03-04-2003, 11:27 AM   #69
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BTW, Dfnt, Can I have your engine? Even swap.....

(Are you figuring your mileage right? Don't use the gauge, and if you skipped writing down a filling yoru mileage will go way up hehe)
Old 03-04-2003, 11:38 AM   #70
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I tune my engine every year, get my oil changed every 3 months, replace my piston rings every 2 years or how ever often I get the chance. I also changed out my fuel pump. yes I am doing it right.
I fill my tank every 2 weeks or so and I right down the fill amount. after that I drive it untill it is about empty and I divide the amount of gas by my miles driven. every time it is around 28 city, 32 highway.
Old 03-04-2003, 04:09 PM   #71
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What does it run ($) to get the rings changed? Do you do it yourself? How difficult is it? Do you go under the crankcase, or pull the engine? Also, while you're there, why not just change out the pistons and go 20 or 30 over?
Old 03-04-2003, 04:19 PM   #72
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I dont do it,...I take it to a local shop,...it depends on what else i need done to the truck so Im not sure on an exact price. usually sits around $400,.....and I dont replace my pistons becuase I am saving up for a 350 small block....Im just trying to keep this engine in good enough condition to sell when i get ready to.
Old 03-04-2003, 04:20 PM   #73
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another thing,...if i tried to do engine work on my truck,....I would blow myself up,....im clueless as far as the newer engines go. i like th older 350's and 454's. CARBURATORS ALL THE WAY!!!
Old 03-04-2003, 04:26 PM   #74
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Interesting... What prompted you to change your rings? Blue smoke, anything? You just think it's a good idea? I'm willing to do a lot to get better mileage... Did you notice a big mileage increase after the rings?
Old 03-04-2003, 04:30 PM   #75
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well,....after I started getting into the custom scene, i figured i would save up for a a bored 350, so I figured I would keep my engine in tip top shape until i did. I noticed maybe 4 or 5 miles to the gallon more,...not too much but it is worth it to me simply becuase 1 my engine now is outstanding, 2 its worth almost as much as a new 4.3, and 3 my current engine runs really nice. So i would say it is worth it if you are thinking of switching engines later.
Old 03-05-2003, 03:25 AM   #76
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My Blazer has 140,000 miles on it, but it still pretty good mileage on it. It gets 17 miles per gallon in heavy city traffic. And on a full tank, it'll go just over 340 miles befor it hits the red. I've done a a lot of long road trips with it. Not bad for a high-mileage Blazer.

Alot better than the 9 miles a gallon my fullsize drinks.
Old 03-05-2003, 10:02 AM   #77
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My mum's 464 Ford Econoline got 6 MPG before she sold it. Well, at least mine is better than that, right? RIGHT??!??



Old 03-05-2003, 10:44 AM   #78
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not too bad. as far as this engine goes,...its gonna stay pretty much stock,...I WANT MY 350 SMALL BLOCK!!!!!!!!!!
Old 03-05-2003, 10:45 AM   #79
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oh yeah,.....and traction bars,....lol

I spin my tires as it is,....it'll only get worse with a 350 in it. lol
Old 06-27-2012, 09:13 PM   #80
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Re: 4.3L gas milage?

Quote: Originally Posted by Pewter2000LS
My best was 22.74mpg with 269.2 miles on the tank (11.8 gallons fillup). It was all highway cruising around 70. My average is around 16.2 mpg though. But yes you can get over 20 with a 4.3.
this is what i average too. i was getting pissed that i couldnt get any better than 18 in the city. now seeing that im one of the lucky ones to get that im a lil happier. but in MHO it should still get better milage than that
Old 06-27-2012, 09:46 PM   #81
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Re: 4.3L gas milage?

I get 14.6 mph when I tow a loaded 2 ton trailer into backyards and through the construction yards, but with trailer off I get 200 miles on 10 gallons, maybe better. A 1999 S10 Vin X 4x4. Recently went bumper to bumper on all electrical, found a few borderline sensors and due to a lean condition through all speeds, I found the distributor gear was the culprit. Didn't replace it with the garbage plastic base. That repair will be watched, my S10 has been feeling good since then.
Old 06-27-2012, 10:06 PM   #82
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Re: 4.3L gas milage?

The warm up may have been a myth back when trannys were linkage and vacuum type. They always made metal to metal sounds, but I know my electronic tranny, the control is set to a predetermined parameter when not at temperature, discounting my effort to drive the machine. I believe that e-tranny slip should always be done on warm fluid. Now a clutch vehicle, I don't believe driving off cold would be damaging. Today's tech has really changed what fluids we use.
Old 06-28-2012, 04:34 AM   #83
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Re: 4.3L gas milage?

Quote: Originally Posted by wolfmangk
Funny thing is....... I let my truck warm up sometimes 5 minutes, and I live in southern crapifornia... I need a timer or something that says 30 seconds. Doesn't not letting it warm up not let the oil circulate fully and causes direct metal on metal wear? I was told by my parents always to let a vehicle warm up, always.. I suppose if you drove it the day previous a little oil would be coating soem vital parts... How long does it take the oil to fully circulate through the engine?? That would be sweet juicy infromation, because that's all the time you need to let your truck warm up.
Idling is the worst way to warm up a vehicle and it wastes gas. 5 min per day is 30 hours per year.
30 seconds of idle is way plenty to get under way. The engine warms up quicker while driving than while idling. Just don't go road racing for the first 5 minutes and you will be fine. Oil fully circulates though the engine in a matter of seconds.
Old 06-28-2012, 04:58 AM   #84
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Re: 4.3L gas milage?

The reason for warming up is that the piston warm up and expand much more faster then the the actually block and cyl. So that being if the block is cold and the piston are hot it could rub the cyl walls there for leaving gouges, after years of abuse it could lead to poor compression etc etc etc...

I know you could say that the piston being hot is going to happen at low rpms or high rpms but i would much rather have the piston rub at 1200 rpm then 2500rpm.
Old 06-28-2012, 06:07 AM   #85
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Re: 4.3L gas milage?

Check the dates
Old 06-29-2012, 12:41 PM   #86
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Re: 4.3L gas milage?

Had to do some serious digging to find this thread!
Old 06-29-2012, 07:40 PM   #87
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Re: 4.3L gas milage?

lol i used the ever popular search the forum button
Old 06-30-2012, 12:17 AM   #88
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Re: 4.3L gas milage?

from full tank to 1/4 tank is about 255 miles standard cab short bed with a 4.3 non vortec. no mods just bigger tires. kicks into overdrive at 45 and its easy sailing from there.
Old 07-01-2012, 12:19 PM   #89
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Re: 4.3L gas milage?

Quote: Originally Posted by sabbasaun
Intereting, when i first bought my truck new (2001 s10, extcab 4x4), i was getting over 325 miles a tank no problem, now i can barley get 250-275 to save my life... Power is about the same, no mods, with 48,000 miles.... if i had a turbo on it or s/c i probably wouldn't care so much, ohwell..... life goes on!

My 1996 Blazer 4 dr 2 wheel drive would get 300-320 out of a tank. Now it will only get about 240-245 if lucky. The ethanol blended fuel, does not have the energy output of straight non-blended gas, therefore the gas mileage drops some.
Old 07-01-2012, 12:22 PM   #90
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Re: 4.3L gas milage?

Quote: Originally Posted by Atomic Citizen
I get 14.6 mph when I tow a loaded 2 ton trailer into backyards and through the construction yards, but with trailer off I get 200 miles on 10 gallons, maybe better. A 1999 S10 Vin X 4x4. Recently went bumper to bumper on all electrical, found a few borderline sensors and due to a lean condition through all speeds, I found the distributor gear was the culprit. Didn't replace it with the garbage plastic base. That repair will be watched, my S10 has been feeling good since then.
Did you replace the complete distributor? I went to change my cap and rotor and there is some slop in the distributor, you can move the rotor button some.
Old 07-01-2012, 12:24 PM   #91
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Re: 4.3L gas milage?

Quote: Originally Posted by 96Blazer LS
My 1996 Blazer 4 dr 2 wheel drive would get 300-320 out of a tank. Now it will only get about 240-245 if lucky. The ethanol blended fuel, does not have the energy output of straight non-blended gas, therefore the gas mileage drops some.
i'm lucky if i get 220 out of a tank on mine (97 4 door 2wd with full tune up and new intake gasket)
Old 10-19-2012, 02:05 PM   #92
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Re: 4.3L gas milage?

Quote: Originally Posted by DfntPntbll
I tune my engine every year, get my oil changed every 3 months, replace my piston rings every 2 years or how ever often I get the chance. I also changed out my fuel pump. yes I am doing it right.
I fill my tank every 2 weeks or so and I right down the fill amount. after that I drive it untill it is about empty and I divide the amount of gas by my miles driven. every time it is around 28 city, 32 highway.

kudos for loving the 4.3 and doing all that work but I've been working on cars a long time. I think the rings or rebuild you do is a bit overkill. The shop must love you. Why did you do that EVERY 2 years?
Old 10-19-2012, 03:01 PM   #93
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Re: 4.3L gas milage?

my 01 crew cab 4wd get about 10 mpg only go about 200 miles on a tank still not sure of the gallons my tank will hold (19 or 20) the cc came with both
Old 10-19-2012, 04:11 PM   #94
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Re: 4.3L gas milage?

I get I'd say about 20ish. Highway for me sucks too. And yea i can fill my tank with about 40 bucks. Sometimes 30. Idk what size these tanks are but they seem small, even though mine looks big
Old 10-19-2012, 04:20 PM   #95
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Re: 4.3L gas milage?

I'm averaging 18.4mpg, my best was 21.7mpg and my worst was 16.6mpg. according to Fuelly.
Old 10-19-2012, 11:14 PM   #96
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Re: 4.3L gas milage?

Quote: Originally Posted by frostystones
I'm averaging 18.4mpg, my best was 21.7mpg and my worst was 16.6mpg. according to Fuelly.
Mine is about the same, all stock. Lucas fuel additive added every tank. Did the TB mod, had car4option CAI on but took it off (well, it broke) but i was going to switch back anyways. Its a '96 sten, 4.3 (x) auto w/3.42 rearend, 3 door step side with a bunch of tools in it. I think Im just going to get a tune from pcmforless or pcm performance like i did with my caprice. Thats what i recommend to all!! you can get an economy tune or power/economy. Good stuff
Old 10-21-2012, 02:38 AM   #97
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Re: 4.3L gas milage?

yea my blazer is like 19-20 mostly 55mph highway but decent ammount of stoplights.

now my 4 banger s10 can get 30+ on highway trips and easy 500 miles to a tank. its great having to fill up like 6 times in an oil change haha.

i dont think the mpg makes me mad its the fact it seems i cant drive anywhere without seeing the gas gauge go down. and only lasts like 250-300 miles to a tank. im used to 300+ miles being half a tank with my truck!
Old 10-21-2012, 05:10 PM   #98
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Re: 4.3L gas milage?

how do you guys tell your MPG? i just guess
Old 10-21-2012, 07:23 PM   #99
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Re: 4.3L gas milage?

Quote: Originally Posted by MotorNut123
how do you guys tell your MPG? i just guess
I add 10 gallons, set Trip meter to 0, and once I get to the same point in the gas gauge (almost empty usually), I divide by 10.

My S10 gets about 20 mpg, highway, and 15 city/mixed.

I'd love my S10 if I can get 23mpg highway and 18mpg city or mixed. LOVE IT. But not going to happen.
Old 10-21-2012, 08:18 PM   #100
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Re: 4.3L gas milage?

Quote: Originally Posted by MotorNut123
how do you guys tell your MPG? i just guess
Fill your tank, and when it gets below 1/2, refill it and record how many miles you drove.
Lets say you drove 225 miles and it took 10.26 gallons to refill it.
225 divided by 10.26 = 21.93mpg
You may have to average several tank fulls to be accurate. Just try to fill up the tank the same way each time.
If you run your tank to the e mark, the mpg figure will be more accurate............ a lot depends on how you top off your tank. Just do it the same each time.
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