The average bus gets between 6 and 9 mpg, depending on many factors (size of bus, wind, speed, and of course how heavily loaded). That being said, it's not usually gas mileage. The majority of buses have diesel engines. Some run on propane, and a few on gasoline, but mostly diesel.
Thanks in part to these technologies, U.S. freight railroads can, on average, move one ton of freight nearly 500 miles per gallon of fuel, making rail the most fuel-efficient way to move freight over land.
The data was obtained from multiple sources, then synchronised, processed and presented using a MATLAB program. The results indicate a fuel economy of between 7.3 to 8.8 mpg for the diesel hybrid bus operating in London.
While the average car engine has about 200 horsepower, locomotive engines typically range from 2,000 to 4,500 horsepower. Train operators rely on diesel power across the full range of rail power applications.
Which mode of transportation is best for the earth? Actually, the bus -- specifically, city-to-city buses like the Greyhound. The bus itself gets a paltry 6 miles per gallon. The reason buses are environmentally sound is that they are usually full of people, giving it the highest miles per gallon per passenger, at 208.