Overall, I like the injection. At first, it was a little intimidating trying to tune it, but once you get used to it, it's pretty nice. On the Hot Rod Power tour this year, I drove from Effingham, Ill to Springfield, MO which is about 600 miles. I averaged 22-24 mpg. I was driving between 80 and 145 the whole way with an average speed of probably somewhere around 90 mph. Response blows away 99.9% of all carbeuration setups that are actually set up right. I can be rolling somewhere around 40 or 50 mph in 2nd (I have a 700R4 trans) and nail it and it instantly goes sideways. I have yet to get any dyno time as I told myself I would not spend the money until I redid my engine with the JE ultra lite pistons, my head portwork and flowbenching, my new 30# injectors and a cam change. I am expecting somewhere around 500 flywheel HP which should factor out to somewhere around 300-350 Rear wheel HP after you figure in the loss through the trans and 9" rear. One of the 1st things I did was take the fixed Fuel pressure regulator off and replace it with a Hypertech adjustable. You can do some pretty decent tuning with that, too. . If you have any tunability questions, let me know and I will see if I can help.