Reviewed By marr s (Hurlock, MD) Reviewed for a 2004 Chevy Avalanche —2/2/2016 1:18 PM
the horsepower out put was substandard. and I actually got better fuel mileage in the extreme mode then I did in the eco mode.
Reviewed By Terry K (YUCAIPA, CA) Reviewed for a 2009 Dodge Ram —1/25/2016 9:15 AM
I bought this to improve mileage. It did improve mileage about 5 mpg (average about 24 mpg), but only about 1-2 when towing (average 14.5 mpg). The mileage coach is helpful as are the many gauges. Although I have never used the performance settings, my throttle response and acceleration is greatly improved over stock.