Reviewed By Charles U (Saint Peter, MN) Reviewed for a 2012 Nissan Frontier —2/8/2016 12:15 PM
Easy, took just a few minutes to program and what a difference it made in acceleration! I haven't checked the mileage, but it doesn't matter much.
Reviewed By Will B (HUBBARD, OR) Reviewed for a 2011 Jeep Grand Cherokee —2/7/2016 5:57 PM
Read that works best if used with premium fuel, have ran premium in it the whole time I've owned my jeep. It does actually work as advertised. More power across entire RPM range, has increased my mpg by only 2 though nut still an improvement.