'04 Ram 2500 Cummins with 35" Nittos. Not being very tech savvy I chose to install Program #2 (towing) to compensate for the oversized tires and for more torque while towing our 23' toy hualer. Installation was easy, including recalibration of the speedometer. Better throttle response and more power were immediately obvious and my fuel economy increased by 1.5-2 mpg. The truck also tows our trailer with much less effort. I am very satisfied with the Smarty Jr.
I only used it for one day because the truck is in the middle of an oil consumption test that still has 1,000 miles left. It did as advertised keeping the vehicle in V8 mode. On side effect that was unexpected was the transmission that has shifted erratically since new was shifting smooth? Coming up to stop sign the truck would act like I still had my foot on the gas. That went away also. Can't wait till I leave the device in permanently. Well worth the money.
Unleash the ECOBEAST
If you want to get better gas mileage and more horsepower then look no further. This thing will make the monster come out in your ECOBEAST. This is the best thing since sliced bread. I have tried the economy and the performance levels and gained 3 miles to the gallon. It's super easy installation and make sure you update it prior to installing.