Originally Posted by RED RAM SPORT
I have a Superchips FlashPaq on my 07 5.7. I tried the performance tune with 91 octane at the drag strip just to see what it would do. The truck ran mid 15's and the tail pipe tip was very rich and black. The truck only had a few thousand miles on it at the time. I use the 87 octane tune all the time, even when towing. The tuner was great for correcting my speedometer for larger diameter rear tires. The Tow-Haul mode works pretty well, keeps you in gear longer and gives you some engine braking. I get about 14.5 MPG in town and close to 20 at 70 MPH. I also have an AFE CAI and an AeroTurbine muffler.
Also I run the 91 oct tune normally 04 5.7 and I have noticed that my tail pipe is black; do you not notice that with the 87 tune?