[aerohead]

*It's hard to make a call on it.
*In February,when you brought it home we saw 15-mpg at 65-mph.Can you tell us about those trip conditions? You were running empty,maybe 7,800-lbs?
*In May,on the camping trip you were running at 55-65 mph,so the lower speeds might have influenced the 14 mpg.
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*AeroStealth had a Coleman pop-up,smaller,much lighter,but maybe similar frontal area,and he's seen in the 20s pulling that behind the Toyota Highlander,which is between the RAV4 and 4RUNNER.
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*Curves make a difference.Alex Tremulis lost 15-mpg while in curves on the raceway where he was testing the Subaru X-100 Gyronaut.
*The hills would certainly impact mpg.
*You were running 9,500-10,000 lbs.
*And your speed was higher.
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If you did every trick in the book you'd get the Cd of the rig below Cd 0.15.And you'd have a world record for mpg.It would cost enormously in time and $$$$$$$$$.
Too bad RV manufacturers are stuck in the 19th-Century.