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If the Mythbusters data is correct then it appears to me that the web type tailgate should easily be worth the money to buy or build it. They say they got 5% better efficiency. This means that a $4 gallon of gas would have an equivalent cost of only $3.80. With every 20 gallon fill up you would save 4 dollars.
You could easily make a web tailgate out of any old scraps of rope, canvas, clothing or whatever.
I also think it would be easy enough for anyone to test the actual fuel usage with a cruise control, a scangague or other means of measure fuel injector duty cycle (pulse width) and a level, traffic free road of a couple miles length in which to do some A-B-A testing. I may do it sometime but where I live I would have to drive at least 30 miles to get to such a road and would have to do this at 3 or 4 in the morning to avoid any traffic.
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