"So why is the human body so much more efficient than automobiles?It turns out that they aren't that much more efficient. Car engines aren't superbly efficient, that's for sure. But What's much more inefficient is the fact that 95% of the net weight of a car is car... only 5% is the driver. Only 65 of the 1,800 calories used to move the car that mile are for the driver. The rest is used to move the doors and the roof and the airbags and the cup holders with you. "
http://green.yahoo.com/blog/ecogeek/360/50-miles-per-burrito.html
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