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Old 02-21-2011, 10:29 PM
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cudase cudase is offline
Dodge Ram Forum Senior Member
Join Date: Feb 2011
Location: MI
Posts: 157
Gender: Male
Vehicle: 2011 Dodge Ram
Trim Level: Sport Crew Cab
Color: Mineral Gray Metallic
Engine: 2009-2010 345ci (5.7L) Hemi V8 390hp 407lb/ft
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cudase will become famous soon enough

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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