Quote:
Originally Posted by jeff88
I can see why you got no improvement in MPG for the higher octane fuel. Unless your engine requires it, nothing changes to the FE. Higher octane doesn't mean higher energy content.
Good luck and have fun!  |
Do you have a tuner? I am not surprised you saw no change, as the engine tune was the same. I run a Superchips 91octane tune in my truck. It was worth 1-1.5mpg, and 20hp.
[edit] just saw the last post. I don't think you'll see any mpg with the 87 performance tune, but it should have better drivability than stock. If you have a plastic intake manifold like I do, and an electronic throttle, I suggest you install a ground wire from the throttle body to the car body. It helped the wife's car, which has both (my truck has an "older style" cable throttle)--reduced offline hesitation. HEMI guys report good results (they are electronic throttle).
[edit2] I like my ATI under drive; it's 25% so that might be a bit much for you.