According to this calculator http://bicycleuniverse.info/transpo/energy.html http://bicycleuniverse.info/transpo/energy.html A 155 lb. cyclist gets about 75mpg

According to this calculator http://bicycleuniverse.info/transpo/energy.html http://bicycleuniverse.info/transpo/energy.html A 155 lb. cyclist gets about 75mpg equivalent, factoring in a typical diet. The vegan gets 145mpg. The site also claims that even with an all-beef diet, cycling is more efficient than driving. A physics professor (http://physics.ucsd.edu/do-the-math/2011/11/mpg-of-a-human/ http://physics.ucsd.edu/do-the-math/2011/11/mpg-of-a-human/) gets similar results: factoring in the carbon footprint of extra food consumed, biking comes in at roughly 70–130 MPG. Even these analyses don't seem to include the embodied energy it takes to manufacture a car, which is huge and should be considered a tax on every mile driven. Bicycle manufacturing is obviously much less energy-intensive.