You guys need to go back to the top and read this again. Frank, see Post#4. Thanks for your interest.
An E350 with a box is no streamliner. Do you have a 4.10 rear end?
The 31+MPG truck is not mine and he didn’t back up the number with much or share any running adverage. It may also be a fluke ideal conditions result. Here is the Diesel forum tread on the claim.
31.07 Mpg - Diesel Place : Chevrolet and GMC Diesel Truck Forums
A stock truck can get 25+MPG at 55MPH. The problem is they run out of gears at 55MPH and everyone drives at 65-75MPH anyway.
I see 20MPG at 65MPH with 285/75R16 BFG AT’s.
I like the cap design in this video.
It looks like one of my all time favorite cars; the 1971 Buick Riviera. Note the caption under photo.
