Fuel Higher Calorific Value (Gross Calorific Value - GCV) kJ/kgBtu/lb Acetone29,000 Alcohol, 96%30,000 Anthracite 32,500 - 34,000 14,000 - 14,500 Bituminous coal 17,000 - 23,250 7,300 - 10,000 Butane49,51020,900 Carbon34,080 Charcoal29,60012,800 Coal 15,000 - 27,000 8,000 - 14,000 Coke 28,000 - 31,000 12,000 - 13,500 Diesel44,80019,300 Ethanol29,70012,800 Ether43,000 Gasoline47,30020,400 Glycerin19,000 Hydrogen141,79061,000 Lignite16,3007,000 Methane55,530Oils, vegetable 39,000 - 48,000 Peat 13,800 - 20,500 5,500 - 8,800 Petrol48,000 Petroleum43,000 Propane50,350Semi anthracite 26,700 - 32,500 11,500 - 14,000 Sulfur9,200 Tar36,000 Turpentine44,000 Wood (dry) 14,400 - 17,400 6,200 - 7,500 1 kJ/kg = 1 J/g = 0.4299 Btu/ lbm = 0.23884 kcal/kg 1 Btu/lbm = 2.326 kJ/kg = 0.55 kcal/kg 1 kcal/kg = 4.1868 kJ/kg = 1.8 Btu/lbm 1 dm3 (Liter) = 10-3 m3 = 0.03532 ft3 = 1.308x10-3 yd3 = 0.220 Imp gal (UK) = 0.2642 Gallons (US) kJ/m3Btu/ft3 Acetylene56,000 Butane C4H10133,0003200 Hydrogen13,000 Natural gas43,000950 - 1150 Methane CH439,820Propane C3H8101,0002550 Town gas18,000 kJ/lBtu/Imp gal Gas oil38,000164,000 Heavy fuel oil41,200177,000 Kerosene35,000154,000