I just ordered the Superchips Flashpaq. I Got my 33's this past weekend and didnt think it would be a big deal to have to add 1-3 mph to the speedometer to guess my actual speed. I was wrong it annoyed the hell out of me. Anyways can anyone comment on the 87 vs 89 vs 91 tune relating to MPG. I realize that many people love the extra power that superchips flashpaq provides (not that it won't be nice) but I'm not so much concerned with that. My question comes from which tune gives what MPG increases with similar driving habbits? I am looking to get better miles per dollar (seeing as how mid grade and premium cost more) not necessarily MPG.

 

Man, there are many many post of this but to break it down for ya. In my experience, if you are looking for the best value in fuel mileage (miles per $ as you say) then run the 87 octane setting with the same fuel. I can't say that I know for sure the higher octane provides any more miles per gal, just a little more power.

 

I ran 91 performance for a wile. I get better mileage with 91 towing, and it drives better for the around town driving I do. With 33's and auto I get almost 13, I got 11 before superchips.