I friend of mine has a rear engine Freightliner based Class-A RV, even the storage area underneath is insulated, and it's designed for cold weather. Warm in the winter, cooler in the summer because the engine heat/mass is far from the driver.
That said, I found this:
https://www.campingrvbc.com/how/rv-p...0A,Pack%20less.
Quote:
Drive a smaller RV. The larger the rig, the more gas it consumes. A 40-ft Class A consumes 18-29 litres/100 km (7-13 mpg). A smaller Class C can expect to get 16-23 litres/100 km (14-18 mpg); while a Class B gets a more thrifty 11-13 litres/100 km (18-25 mpg) or better. The same goes for a trailer or fifth wheel – the smaller the unit, the less gas or diesel is consumed.
Pack less. The heavier your motorhome, the more fuel it costs to haul it. If you don’t need it, don’t bring it.
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I think the comments above being premised on weight is because most manufactures give little consideration to aerodynamics. So take that into consideration.
When I was looking into the Cab-Overs, the weight compared to a full sized pickup trucks was 50% more and the fuel mileage suffered for it.