3 Miles per Pound I'm an engineer by trade, and I had and idea while standing behind an obeast.  Would it be possible to power a car from human fat? According to this research animal fat can be used to make biodiesel, and human fat is not substantially different from animal fat. 1 pound of fat is 3500 kilocalories or 13,879 BTU. 1 gallon of gas has 124,000 BTU which is the equivalent of 8.9lbs of fat. My car averages 28MPG or 3 miles per pound of fat. 100 pounds of fat would be enough to fuel my car for a 300 mile trip. I think I've just solved the energy crisis.