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I'm sorry but I'm going to have call bs on this too.

I hypermile the crap out of my '01 360 4x4 1500 w/ 4.10's and the best I can get is 18 at 50 to 55mph. The converter is chopped out, it has a Flowmaster 40 and an electric fan.

Also I would have to see this 3/4 ton "spin the tires" (on dry pavement, I'm assuming) to believe it.

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4.10s are killing you, running around with no load is making the engine fight vacuum to pull the piston down and friction is a lot higher. It is pretty funny to hear some put hyper-miling and 4.10 gears in the same sentence