An all diesel coach bus averages 2.5 mile to the gallon Metro Style Buses closer to 3.5mpg. A full size bus holds about 250 gallons of fuel. This make the range about 625 to 750mpg depending on the style of bus.
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Diesel Versus GasIn general, diesel fuel gets better gas mileage compared to unleaded gasoline. That's why many executive coaches and sprinter vans run on diesel. While less refined than unleaded gasoline, diesel engines get more power compared to gasoline. Limos generally run on gas because diesel engines are louder.
Motorcoaches move people with little fuel. The average fuel efficiency of a motorcoach is 6.1 miles per gallon of fuel. With this fuel efficiency, a motorcoach carrying the industry average of 36 passengers achieved 240 passenger miles per gallon of fuel.