Quote Originally Posted by Ldub View Post
FWIW...I have my doubts wether an OD will have much appreciable value with regard to mileage, especially if you choose to run larger than stock O D tires.

I'm rolling 35's, & my mileage got a little better with the addn of 4:77 gearing.
Indicating to me, that the mileage "sweet spot" is 2k & above.

Maybe for the occasional downhill grade, but for flat land running, I have my doubts.
Well....35's do weight a lot, lift the body up, and create more drag. FWIW, vettes with the A4 get 25mpg. With the ZF6, it moves up to 30mpg. Big difference slowing a SBC down (for hwy mpg).