Paluby
Senior Member
If you're referring to the lower gears, they actually help in the city. Highway is where they will hurt you a little over 70mph.
My guess is the winter fuel is negatively affecting mileage as it does for most. How much idle time are you seeing? Warming the truck up and sitting in traffic doesn't help.
Idle time definitely affects my average. Why I said sport earlier though was cause the dealership here told me all sports have 3.92 gears. They may have been mistaken.
Either way, I think over the life of the truck one with 3.21 vs 3.92 gears with similar driving history, the 3.21 geared truck would have the better fuel economy. Just my opinion though.
