18. Fuel chemistry Source: “Properties of Fuels,” www.afdc.energy.gov ~0 n/a 100% ~0 ~0 Water solubility 16k 20k 12k 19k 19k Heat content (BTU/lb) 77% 75% 52% 87% 85-88% Carbon % C 12 to C 22 CH 4 C 2 H 5 OH C 4 to C 12 C 4 to C 12 Formula Biodiesel CNG Ethanol Diesel Gasoline