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Old 02-21-2011, 09:29 PM
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cudase cudase is offline
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I have spent some time doing scale tests in a wind tunnel to determine the effects of running with and without a tonneau cover. Using a tonneau cover did decrease the coefficient of drag on our scaled model. The decrease was by less than 5%, but that can still account to fuel savings. A decrease in 5% Cd could result in up to a 1% increase in fuel economy, which is not a lot, but over 1000 gallons of fuel consumed, you may save 10 gallons.
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