"Welcome Aboard."
Your motorhome numbers sound very familiar: I drove a Condor Van (390 Ford industrial engine & automatic tranny) "instrumentation" van from U.S. Army Yuma Proving Gound, Yuma, AZ, to and back from Fayetteville, NC, back in 1973 and got 8 mpg at 55 mph (OPEC oil embargo was in progress and 55 mph was the "National" speedlimit)...and, the "tongue-in-cheek" descriptive terms "aero-barn" and "aero-brick" come to mind.
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