[Edahall]

For the 1990 Suburban listed in my signature, I'm getting on average mid 20's with that setup. At the price of fuel these days, it has already paid itself off.

But my 1982 Suburban 6.2L diesel (1/2 ton, 2x4, 3.08, 700R4) does even a little better. With some help from some exhaust headers, fuel economy is in the upper 20's. I even got 31 mpg one time on a long trip being very careful with the gas pedal.