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Old 06-21-2009, 11:31 PM   #6 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)
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Most of the drag reduction is going to happen at the back of the truck. (I suspect you already know this, judging by your chosen username!) The max frontal area exists at the very end of the vehicle = bad news.

So boat-tailing will help, as will shrouding the rear wheels by extending a skirt below the box, as you've probably started to see on tractor trailers.

That's just a start....
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