Motorhome MPG has more to do with motorhome and its size (weight and aerodynamics) and driving conditions than with differences in engines alone.
How do we know if 8.2 MPG is good or bad? Did friends have same MH model with V10, or are they comparing to a minivan? How fast were they driving, 60 or 80 MPH?
Perhaps you can share pertinent data for comparison.
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