what is the gas mileage of a class c rv
There will be no significant difference but the C will have a small advantage. Even differences in weight has little effect-the main factor in [low] fuel mileage is the amount of frontal area, which is what causes wind resistance. C's are generally a bit lower than an A, but both are large and blunt. Smaller C and A's with gas engines will be around 9-10 mpg, while the larger ones are more like 8.