There's a nice comparison here: https://truecostblog.com/2010/05/27/fuel-efficiency-modes-of-transportation-ranked-by-mpg/ https://truecostblog.com/2010/05/27/f

There's a nice comparison here: https://truecostblog.com/2010/05/27/fuel-efficiency-modes-of-transportation-ranked-by-mpg/ https://truecostblog.com/2010/05/27/fuel-efficiency-modes-of... Although that seems to only consider diesel-powered buses. CNG or electric buses are better.