AFM (Another f***ing Mistake) is one of the big reasons my next truck will not be a GM.
MIne has been turned off for years, it made ZERO difference in overall MPG, but it made a HUGE difference in QPM (quarts per mile)...with it on, it ate 1 qt/1000 miles.
MIne has been turned off for years, it made ZERO difference in overall MPG, but it made a HUGE difference in QPM (quarts per mile)...with it on, it ate 1 qt/1000 miles.

