Quote:
Originally Posted by Frank Lee
I don't have direct experience but I do recall an old Popular Mechanics article about ecomodding a small pickup and they said a regular decently fitted topper was better than none. IIRC they said it was better than a tonneau too, but I'd have to go find it. Also the LEER topper site had wind tunnel results from toppers and tonneaus.
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I would say that the capper would help FE slightly and probably more than 1%
Take a look here:
http://ecomodder.com/forum/showthrea...pes-11183.html
Go to Figure 14.
Notice that the drag of a boxy shaped object gets lower as the length/width ratio is increased. The capper will effectively make your truck longer and this helps your fuel economy.
Jim.