Sucess!
 

I had two consecutive 20 mpg tanks out of the Blue Beast driving to and from my camp. The first tank even included about 50 miles of off-road driving. The second was all highway.

I kept the truck at about 64 mph, and there was no canoe on the roof this time.

Some more aero mods would maybe get me to 25 mpg. I already have a grill block and skinny tires. What do you think I should try next?

Belly pans and a bed cover w/ the right angle.