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The most aerodynamically economical motorhomes are the "parked" ones that aren't "pushing" ANY air (wink,wink).
Drove a Condor van (390 Ford industrial enginge & auto trans) from Yuma, AZ, to Fayetteville, NC, in early 1973, it got 6 miles per gallon...of course, it ALSO had a combined 300 gallon fuel tank system (shared with onboard Onan ICE power plant). 300 gallons of gasoline is almost a TON of weight (~1850 lbs)!
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