I have a '14 Mega Dually CTD/Aisin/3.73's/4WD Limited. I picked it up from the dealer in SC and drove it home to CT. Just as I had to hit the brakes at the CT state line, the Lie-O-Meter was saying 19.6. I think it was the third tank of fuel. This winter has been a great test. Not one problem! Winter blend knocks the mileage down, so does stop and go traffic. But, it still beats the heck out of my old Ford V10 gasser. Might have something to do with the higher rear gears and 2 more in the tranny;) cuz she weighs about 1 ton more than the Ford! 8660# 3/4 tank and 6 tires in the bed.