Works As Advertised....better than expected
Reviewed By Luther B (Warner Robins, GA) Reviewed for a 2007 Chevy Avalanche —3/29/2015 8:59 AM
Simply amazing! I've always wondered why GM incorporated this feature without allowing the driver to switch it on or off. This device is the answer to that question! Personally I've seen a noticeable difference in the power on acceleration from a stop as well as a 1 to 2 mpg increase during normal driving. If you have a GM vehicle with an active fuel management sys, this device is a must. Oh, I forgot mentioned the fact that I just spent $1350 to have two lifters replaced due to fatigue.
2015 F350 recalibration
Reviewed By Jeff J (Diamondhead, MS) —3/26/2015 5:18 AM
I have a 15 F350 and changed from the stock 34" tires and went to 37" tires and installed the Speedo Calibrator. One thing to remember when entering tire info even if you look up the numbers in height. The stock tires are 34.1" vs the 36.54..you need to measure once the tires are installed on the truck and on level ground. My 37's once compressed are about 36.25 Entering this number got me closer to the real GPS on my phone vs running 2 mph slower at 75mph. Ill be using 35.75, to get it closer.