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Gas mileage w/ a V8

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Old 10-03-2009, 12:06 AM   #1
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Gas mileage w/ a V8

Just wondering what kind of gas mileage you guys are getting with a V8. Please post what setup you are running as well (carbed, FI, TBI, etc.) I am going back and forth on the V8 and would like to go carbed, but I'm afraid my gas mileage would REALLY suffer. I have to say though having the torque and HP of a V8 to move around a light little S10 might do better than the 4.3..... as long as you don't have a lead foot
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Old 10-03-2009, 12:11 AM   #2
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Re: Gas mileage w/ a V8

Mine gets 3 gallons to the mile..........j/k

I would say I get about 10-12.....but that's not really what mine is built for.

355, 11:1, Solid Roller, N2O, 750 Demon(for now), th350 and 3.70's in a 9".

Almost in the 9's
Old 10-03-2009, 12:38 AM   #3
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Re: Gas mileage w/ a V8

Got 16 with a carbed 350/700R 3.08 rear, but I didn't take it easy on the truck either.
Old 10-03-2009, 01:39 AM   #4
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Re: Gas mileage w/ a V8

^ Thats about what I get 13-15 mpg carbed 350 sbc/TH350 stock gears.
Old 10-03-2009, 11:48 AM   #5
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Re: Gas mileage w/ a V8

vortec 355 with lt4 hot cam
t56 trans
4.10 gears

on a shitty tune running pig rich i got 17-18 city and 24 highway.

im hoping with a good tune and a few more mods that i can get 26-28 highway
Old 10-05-2009, 06:25 PM   #6
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Re: Gas mileage w/ a V8

Quote: Originally Posted by tippmann243
vortec 355 with lt4 hot cam
t56 trans
4.10 gears

on a shitty tune running pig rich i got 17-18 city and 24 highway.

im hoping with a good tune and a few more mods that i can get 26-28 highway
Thats pretty good and thats what i hope to achieve with a stock to mild LT1 swap. Hell my 2.2L only gets me about 18-20 city with 29 in tires
Old 10-05-2009, 07:57 PM   #7
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Re: Gas mileage w/ a V8

about 15-16 liter/100km, with 357 440hp holley 750 double pumper, 3.73 , Nv3500
Old 10-05-2009, 09:02 PM   #8
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Re: Gas mileage w/ a V8

Quote: Originally Posted by dirty_drew
Thats pretty good and thats what i hope to achieve with a stock to mild LT1 swap. Hell my 2.2L only gets me about 18-20 city with 29 in tires
yeah i was throwing a bank 1 and bank 2 rich code the whole way there
Old 10-06-2009, 12:57 PM   #9
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Re: Gas mileage w/ a V8

ive got a 97 vortec 350 in my 00' Sonoma and im getting 26-28 highway driving 100 km/h consistantly...which is almost better than what my subaru wrx is getting haha
Old 10-06-2009, 03:42 PM   #10
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Re: Gas mileage w/ a V8

ls1 t56 with turbo, i get about 25mpg. 3.73's
i also cruise at 80-85mph. Boston traffic is NUTS!
Old 10-08-2009, 02:55 AM   #11
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Re: Gas mileage w/ a V8

Built 355, cammed, and running a carb setup with a th350 and im only getting between 8 and 10. How are you guys getting so much higher lol
Old 10-08-2009, 12:16 PM   #12
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Re: Gas mileage w/ a V8

93s10 with lt1/t56

old setup:
95z28 lt1 bored .30 over, very small cam (205/210 duration)pretty much stock everything else besides headers, and ported intake w/ 3.42s I got 14.5-16mpg

new setup:
same as above except the truck now has the heads freshly rebuilt again with proper components and 1.6 roller rockers, and a Ernson 218/224 duration and .490 lift cam
Best i have gotten wiht this setup (still on the tune above so theres a lot of improvement i can net still), best was 17.5mpg. That was a mix of hwy/city driving.

I am banking on 17+city and 20+hwy when i get the tune and when the 4.10s get installed.
Old 10-08-2009, 01:24 PM   #13
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Re: Gas mileage w/ a V8

Around 26 highway with a 4l65e and 3.73 gears
Old 10-08-2009, 01:55 PM   #14
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Re: Gas mileage w/ a V8

Quote: Originally Posted by Fast_Casper93
How are you guys getting so much higher lol
if you notice, all the guys with big numbers are all running fuel injection, and most have an overdrive tranny or a manual

a carbed 350 with a th350 usually never gets much higher than 12... "usually"... theres always exceptions though
Old 10-08-2009, 06:24 PM   #15
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Re: Gas mileage w/ a V8

Quote: Originally Posted by Fast_Casper93
Built 355, cammed, and running a carb setup with a th350 and im only getting between 8 and 10. How are you guys getting so much higher lol
we all have embraced something called technology and are reaping the benefits from it.
Old 10-09-2009, 03:36 AM   #16
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Re: Gas mileage w/ a V8

Quote: Originally Posted by tippmann243
we all have embraced something called technology and are reaping the benefits from it.
couldn't have siad it better hahaha
Old 10-10-2009, 05:00 AM   #17
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Re: Gas mileage w/ a V8

I kept my Vett Lt1 stock for drivability and gas milage. 308 locking rear. Built OD trans. FI. 16-18 in town and 22-24 highway with a shitty tune. I'ts still running a little rich.
Then there's the biggest tires I could fit under it. Just drop a couple tire sizes down and the gas milage would easly improve, but with the larger sway bars and extra good racing shocks I just can't bring my self to do that.
Old 10-10-2009, 12:00 PM   #18
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Re: Gas mileage w/ a V8

carb 350 th400 i get about 11-14 thinkin about switching 2 a 700r4 tho!
Old 10-10-2009, 05:44 PM   #19
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Re: Gas mileage w/ a V8

I have a 3rd gen carbed camaro with a 355 and a rebuilt 700R4 and I get 26mpg, but only when I'm babying it
Old 10-22-2009, 03:06 AM   #20
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Re: Gas mileage w/ a V8

built 350 412hp carb 700r4 370's in a 9'' bout 11mpg keep in mind im a police officer and can not have a heavy foot
Old 01-02-2010, 12:22 AM   #21
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Re: Gas mileage w/ a V8

What could I expect with a 350 TBI vs TPI?
Old 01-02-2010, 11:02 AM   #22
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Re: Gas mileage w/ a V8

Quote: Originally Posted by Poptart
What could I expect with a 350 TBI vs TPI?
i know it wasnt uncommon for the TBI 305s to see as high as 22 mpg, look up some of the fuel milage numbers for the 3rd gen camaro and firebirds, and the old monte carlos and such that had the 350

TBI wont get as much as a TPI, but it will still be way better than a carb
Old 01-02-2010, 06:31 PM   #23
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Re: Gas mileage w/ a V8

Right now it has a carbed 305 /350 turbo and I'm getting 20 on the highway. Currently building a mild 355 with 700r4, so hope to get around 25mpg.
Old 01-03-2010, 02:32 AM   #24
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Re: Gas mileage w/ a V8

you can get good mileage out of a carb, you just need to run the right carb... a 750 on a 350 is WAY to much carb, not to mention any aftermarket performance type carb is going to be geared towards performance, not fuel economy. If you run a stock type 600 cfm you'll get pretty good mileage and not drown the motor. also an over drive tranny really helps.
Old 01-03-2010, 01:04 PM   #25
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Re: Gas mileage w/ a V8

a good quadrajet is about one of the best carbs around for mileage. and then they can still kick in a butt load of fuel when the time is needed. you just gotta find the right person to make them right.

but my as well add to the thread.
around 500 hp aluminum headed 383. 750 mighty demon mechanical sec. 3.42 gear with a 700r4 2500 stall with lockup and 295/50/15 sittin out back.
even bein mellow with it im lucky to see 13 or so around town. and it aint much better on the highway...
Old 01-03-2010, 01:14 PM   #26
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Re: Gas mileage w/ a V8

Quote: Originally Posted by BlackEsDime
you can get good mileage out of a carb, you just need to run the right carb... a 750 on a 350 is WAY to much carb, not to mention any aftermarket performance type carb is going to be geared towards performance, not fuel economy. If you run a stock type 600 cfm you'll get pretty good mileage and not drown the motor. also an over drive tranny really helps.
Depends on carb design. How many 750 Rochester Q-jets were installed on GM smallblocks? Chevy , Olds, Pontiac, Buick, Caddys. Millions. Small primarys and huge secondaries works pretty good.
Old 01-03-2010, 01:27 PM   #27
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Re: Gas mileage w/ a V8

I had a carbed 305 turck that got 21. Swapped in a 305TPI and got the same.

My new truck gets about 22.
Old 01-03-2010, 09:44 PM   #28
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Re: Gas mileage w/ a V8

well, i'm hoping for about 26 highway in my mazda with a medium built 350/t5 swap. but we're going to have some time in porting and polishing the heads/intake for performance/efficiency. whether that makes the difference or not i don't know... but hoping and getting are 2 different things. I have nothing to show for as of yet.
Old 01-04-2010, 12:35 PM   #29
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Re: Gas mileage w/ a V8

21 1/2 highway mpg at 70 or so. My sig gives the basics. LT1 stock 300hp FI Vett eng with a locker 308 rear gear. Non cat dual exhaust using 2 1/2 pipes. 2000 stall conv with a 4L60E rebuilt with Vett internals.

One thing to take into consideration here is it's still running a little rich so once the computer gets re-tuned the mpg and power will improve.

Last edited by SilverWings; 01-04-2010 at 12:42 PM.
Old 01-04-2010, 03:31 PM   #30
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Re: Gas mileage w/ a V8

It's physics....it don't make sense to some people but it's the truth.

A bigger, more powerful engine will work less to move weight. While you are sucking in more fuel than a V6. You are 25% more efficient and get better economy because the engine don't have to work as hard.

My old LT4/T56 Camaro got 29 MPG at 70mph/1700RPM. My mum's Lexus at the same time is getting 24 MPG at 70/2500RPM. I got twice the engine of her, and her car is about 200lbs heavier than my Camaro. Why do I get better gas mileage. My bigger engine was working less than hers.

Stuffing a good running engine into an S10 will improve economy under normal driving conditions. But if your always driving it around like you can afford to fix what you break.....
Old 01-04-2010, 06:43 PM   #31
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Re: Gas mileage w/ a V8

Quote: Originally Posted by Maaso
It's physics....it don't make sense to some people but it's the truth.

A bigger, more powerful engine will work less to move weight. While you are sucking in more fuel than a V6. You are 25% more efficient and get better economy because the engine don't have to work as hard.

My old LT4/T56 Camaro got 29 MPG at 70mph/1700RPM. My mum's Lexus at the same time is getting 24 MPG at 70/2500RPM. I got twice the engine of her, and her car is about 200lbs heavier than my Camaro. Why do I get better gas mileage. My bigger engine was working less than hers.

Stuffing a good running engine into an S10 will improve economy under normal driving conditions. But if your always driving it around like you can afford to fix what you break.....
the same reason a 220 welder is cheaper to run than a 110 when doing the same job... it doesnt need to work as hard as the smaller unit does
Old 01-04-2010, 09:18 PM   #32
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Re: Gas mileage w/ a V8

Quote: Originally Posted by Maaso
It's physics....it don't make sense to some people but it's the truth.

A bigger, more powerful engine will work less to move weight. While you are sucking in more fuel than a V6. You are 25% more efficient and get better economy because the engine don't have to work as hard.

My old LT4/T56 Camaro got 29 MPG at 70mph/1700RPM. My mum's Lexus at the same time is getting 24 MPG at 70/2500RPM. I got twice the engine of her, and her car is about 200lbs heavier than my Camaro. Why do I get better gas mileage. My bigger engine was working less than hers.

Stuffing a good running engine into an S10 will improve economy under normal driving conditions. But if your always driving it around like you can afford to fix what you break.....
exactly... however it depends on the more powerfull engine is built. efficiency is power, if you have a motor thats just making power off dumping gas into it more/less, its not going to be more efficient
Old 06-28-2010, 10:55 AM   #33
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Re: Gas mileage w/ a V8

I got 21 mpg hwy with my old '85 ext cab with a '72 LT-1 with a 650 cfm 4bbl, locking converter 700R4 out of a '91 vette and 3.08 gears. It got 7 mpg when I floored it everywhere. I could actually see the gas gauge drop and I had a 20 gallon tank. I got 16 mpg pulling a trailer.
Old 06-28-2010, 02:37 PM   #34
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Re: Gas mileage w/ a V8

I moved back to Montana two months ago and hauling a full load of heavy tools in the truck for the 2500 mile plus trip I got 24 mpg. That 3:08 rear gear and the torque of the LT1 Vett eng did quite well having to pull two mountain passes along the way without a wimper.

Very surprised to see it get that much.
Old 07-03-2010, 11:44 AM   #35
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Re: Gas mileage w/ a V8

Ive been getting about 16mpg out of my 4x4 35" tires and 3:73s with a 5speed....290hp crate motor,my 96 has 3:08s and a 5 speed 29" tires and a 480+ hp motor and still getting 17 to 20mpg, side note my 2.8 89 4x4 gets about 12mpg and cant pull a hill to save its ass lol........
Old 07-05-2010, 04:21 PM   #36
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Re: Gas mileage w/ a V8

My 88 with a Tune port 350, turbo 350, 373 gears, gets 14-15 in town, normal driving, 17-18 hwy. If it is driven hard, its not very good. But a lot more fun I would like to change to an od trans, but this works for now.
Old 08-07-2010, 04:45 AM   #37
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Re: Gas mileage w/ a V8

my s10 makes less than 20mpg on average i want a 350 from what ive read id only be loosing a few mpg i have a 700r4 tranny already so im thinking of jsut swaping it id get a k&n headers and an efan no air smog or pwr steering with the 350 think id still get about the same?
Old 08-07-2010, 10:32 AM   #38
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Re: Gas mileage w/ a V8

Quote: Originally Posted by smallblock9466
my s10 makes less than 20mpg on average i want a 350 from what ive read id only be loosing a few mpg i have a 700r4 tranny already so im thinking of jsut swaping it id get a k&n headers and an efan no air smog or pwr steering with the 350 think id still get about the same?
as long as you keep with the overdrive trans, and keep your foot out of it, it shouldnt be too bad
Old 08-07-2010, 01:32 PM   #39
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Re: Gas mileage w/ a V8

awesome ill just have to not "play around" ha ha thanks
Old 08-07-2010, 07:29 PM   #40
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Re: Gas mileage w/ a V8

I get 17ish with my foot on it quite a bit...




But Im also running a 305...
Old 08-08-2010, 12:55 AM   #41
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Re: Gas mileage w/ a V8

I haven't taken the time to really figure it out. But with a 355 and 600cfm edelbrock matched with a new 700r4 and original 3.08 gears in the rear I am maybe putting $50 in the tank a week. That is with driving at least 60 miles a day for work 6-7 days a week. I guess I am going to have to start looking into that. I think that is putting me right around 23 mpg. Rough estimate.

Last edited by towb3; 08-08-2010 at 12:57 AM.
Old 08-08-2010, 07:55 AM   #42
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Re: Gas mileage w/ a V8

Keep in mind that I just got mine back on the road, and have been playing with it pretty hard. but I have a 91-92 L98TPI/700R4 stage 1/373 posi set up to run SPI with the help of the ACCEL DFI and Dual Sync Distributor, but the first tank I ran through it I got about 18. After some fine tuning this week I hope to get in the mid 20's
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