Hi, I'm new to any thing like this, but I thought I might get some info/help from you folks out there. I have a '05 2500 HD regular cab truck. My question is I have the 6 Liter gas engine with 4/10 4/11 gears. My mileage is horrible and want to know if changing the gears to 3/73's would help the fuel economy any. I realize it won't pay for it self any time soon if ever but passing gas station occasionally would be nice