Great tool for the job
After getting rid of the performance robbing 20-inch wheels and tires and installing base model 245/70R17s, the speedo needed correction. Knowing the exact percentage of the change unfortunately doesn't help, so it's a bit of trial and error to get it right since tire height is the only usable criterion. With 30.6 inch tires, and no static loaded radius data, I guessed and used 30 inches. Very, very close. Tried with 30.25", but went back to 30, which is quick and easy with the Hypertech.
What a difference!!
I have been at odds what to do about the AFM system on my 2011 Avalanche. Then after reading the reviews on the Range device, tried it and love the smooth acceleration I get. Gas mileage dropped a little, because I'm having fun driving this thing. Too bad GM didn't put a bypass switch of the AFM system on these trucks or have it as an option. I HIGHLY recommend this device if you can't stand the constant shifting into V4 from V8 and losing out on the acceleration these vehicles do have.