8 MPG is still good for large motorhomes built on 22,000-pound chassis.
Weight isn't as important as many owners think, otherwise motorhomes roughly half the weight would be getting twice the mileage (close to 16 MPG) and that clearly isn't the case. Weight is somewhat important but plays a lesser role in MPGs.
Aerodynamic drag remains the #1 biggest enemy to fuel economy on the highway, which is why slowing down helps so much. It also confirms why much lighter Class As built on 16,000-pound chassis but with similar frontal area get approximately the same MPG on the highway.
I'm personally hopeful that with some design effort and attention to aero design, that smaller Class As can soon get 12 MPG or thereabouts. If these big MHs can get 8 MPG, then 12 should be very doable for smaller units.
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