Just made a full trip to San An today.
I run the 5.9 Magnum. 4x4 with over sized tires.
I average about 9 city.
Usually about 12 highway, but today going 65 cruise the whole way I averaged about 13.3 mpg on the way there (empty bed) 14.1 on the way back with a twin bed and frame in the bed of the truck. - All hand calculated.
All cruise control 65 there and back.
I did pay attention to the road pavement and I got 2-3 higher (from overhead) mpg when i was on smooth asphalt.
"You can't just give up hope and walk away, Cause when you do that then there is no hope at all."