Havent noticed an increase in mpg or HP.
I bought the 60hp and 5-6mpg increase. I did not notice much of a hp gain and my vehicle only went up by 1 mpg. I believe it went up by 1mpg because of the required 150 miles of conservative driving it asks of you before testing it and the suggested 90+ octane fuel i put in my vehicle, 2016 Colorado Z71. After 150 miles i did not notice any improvements. Called the company and they had me reinstall the chip. I have driven it for 80 miles now and have not noticed any increase. its not cheap any suggestions?? Im pretty bummed.