Towed a U-Haul 5x8 cargo trailer loaded full of furniture this weekend. Trip was about 3.5 hrs one way (~230 miles or so). Speed limit was 110 Km/h, or about 70 mph. I obeyed the limit. Weather wa...
You got 12 towing and 17 not towing with a full size truck and you think that's bad. Man, you must not drive a truck much :). That seems really good to me. I've never had a truck, diesel or gas, that would get more than 17 empty. I've never gotten more than about 10, diesel or gas, towing anything. I think your MPG is normal or slightly above normal.