Funny how final drive ratios are all over the place for these birds!(I have 3:38). I once was bold enough to check the highway mileage when I had all my performance gear on my 400: cam, headers, double pumper, single plane, etc. I got 12. Now that I'm going back to stock I'm hoping to get the kind of mileage y'all get, but I don't want to change my original 3:38 posi. Havent heard from the OHC6 club yet- I bet those have great mileage!
