Reviewed By RICHARD J (Parachute, CO) Reviewed for a 2005 GMC Savana —7/13/2014 9:25 PM
Big difference in power. I get 3 to 4 mpg more when using performance level.
Reviewed By Bill H (Ponchatoula, LA) Reviewed for a 2011 GMC Sierra —5/13/2016 6:27 AM
So far I like the performance but really didn't get a fuel mileage increase and also needs some better instructions on how to adjust all the settings. For example how to adjust shift points for certain program's
Reviewed By william s (WINSTED, CT) Reviewed for a 2004 Chevy Silverado —5/22/2016 5:38 AM
I bought a new rv last year, and was unhappy with the trucks pulling performance....so i did some research,and found a tuner would do the job....i did not need all the bells and whistles..just something to change the timing and shift points....this unit was just the ticket....and it was on sale.... cant beat that....have set it to tow mode and it made a big difference....i live in new england (lots of hills)..and no more overreving to pull them...my truck works within its power band .