The Verdic is in, New Ford 7.3 V-8 Gas mpg not so Great

For the best fuel economy per ton/mile you need a high compression long stroke turbo supercharged engine that has in cylinder multi-injection of a high power density fuel... like big trucks use...

Adding more overdrive trans ratios in front of salt flats axle ratios doesn’t do much for tow performance but works great for no load driving.