Reviewed By James C (Springfield, MO) Reviewed for a
2015Chevy Colorado—1/20/2016 2:33 PM
Very little, if any change in power in normal driving. I have tried both 87 and 91 octane tunes with appropriate fuel. Same with gas mileage, maybe a 0.2 to 0.4 tenths increase. Definitely not the 16 and 28 HP gains promised.