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3 references to share
I dug through the rat's nest looking for square bedcover-related material.
I found two articles which may share some insight and one personal experience to share.
(1) When the all-new Chevy/GMC pickups entered the market around 1987,their Cd had been trimmed from 0.535,to 0.45.
In 1992,the Chevy Suburban K 1500 was reported with Cd 0.39,about 11% drag reduction.It's station wagon style roofline closely mimics a traditional square camper shell.
(2) When the VW Vanagon loses it's roof to become the drop-side pickup truck,it's Cd grows from 0.42,to 0.46 ( about 8.5% difference)and with identical power,the top speed falls from 83 to 78 mph.
(3) When John Gilkison owned the T-100 which I now have,on astronomy camping trips,a LEAR square type fiberglass shell was reported to increase fuel economy by up to 1.2-mpg,a 4.8% mpg improvement,and 8% drag reduction.
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