Wanted a little more HP...and got it!!!
I used this programmer in my Coly, 3.7 i5 because I have a 19'Hybrid Travel Trailer that I pull. I filled the tank with 93 Octane and in comparison w/o the programmer...Quite a significant difference. Not quite sure what I got for mileage but for HP there was a noticeable difference. I also installed a K & N Cold Air Intake so as a team, I let out a few more ponies. So far, so Happy!!