Slant Side Tonneau Cover By Sports Master (part # 30-303-01) Its a nice looking and great fitting cover. The cover has a FIVE year warranty. Takes less then 1/4 hour to install, the only tool needed is a phillips head screw driver. Now with over 42,000 miles and still looking like new! 
Here a page about Drag Coefficient with a Dodge Ram pick-up
Take look what is says about tonneau covers!
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