My 3.0L gets used a lot for towing. I think over half the miles I have are tow miles. While towing I can get from 15 to 18MPG depending on my load. When not towing it has great mileage from 25 to a bit over 30 typical with high of 38MPG. I'm totally impressed with this combo of the diesel and the 10 speed. I don't think it ever revs past 3K RPM even when working hard. Just a very good combination.