A smaller motorhome can be expected to get anywhere between 10 and 15 mpg, while a larger motorhome may only get between 6 and 13 mpg. The fuel efficiency of a motorhome depends largely on its size.
Motorhomes use different kinds of fuel. Some of them, especially smaller ones, use normal gasoline, like the average car. However, some larger motorhomes use diesel instead, which impacts the average price of filling a gas tank. Some motorhome users utilize engine tuner chips, which act to increase the horsepower of the engine, resulting in an increase of about 2 to 3 mpg fuel efficiency.