So I like the mileage our 2012 D/A gets with and without towing. We are looking at the Ford F350 with 3.55 rear end and wondering if the mileage is comparable or not.
I'm not thrilled with the mpg of mine either.....65 mph 15.4 miles per US gallon. People I know with the 3.31 gears get conciderbly better. I don't know about the new Duramax but the 2015 Duramax does better than the Powerstroke with 3.55 gears.