Yes, I've checked it with a GPS. It's dead on accurate.

Hi, I have a 2015 Chevy Colorado and I'm using the latest update on an my inTune. I've recently lifted the truck and now run 33"x 12.5" tires. The Diablo Tune helped a bunch with pulling the bigger tires around and recalibrating the speedo. The only issue I have now is getting the truck to shift ...