How Many Calories Are in Gasoline? the Complete Science and Chemistry Guide
By James H. Sterling
To grasp the chemical concentration packed into refined petroleum energy content, one must examine comparative energy density. Fat represents the most energy-dense biological fuel humans consume, containing 9 kcal per gram. Gasoline leaves even pure fat far behind.
| Substance / Fuel Source | Energy Density (MJ/kg) | Approximate Caloric Equivalent (kcal/kg) | Primary Conversion Mechanism |
|---|---|---|---|
| Automotive Gasoline | 44.4, 46.4 MJ/kg | 10,600, 11,100 kcal | Internal spark combustion |
| Pure Butterfat / Cooking Oil | 37.0, 38.0 MJ/kg | 8,800, 9,000 kcal | Enzymatic mitochondrial oxidation |
| Fuel Ethanol (Denatured) | 26.8, 29.7 MJ/kg | 6,400, 7,100 kcal | Combustion / Alcohol dehydrogenase |
| Refined White Sugar (Sucrose) | 16.5, 17.0 MJ/kg | 3,900, 4,000 kcal | Glycolytic cellular respiration |
| Lithium-Ion Battery Pack | 0.7, 0.9 MJ/kg | 167, 215 kcal | Electrochemical ion exchange |
The numbers illustrate why petroleum transformed transportation: gasoline carries roughly 50 times the energy density of current state-of-the-art commercial electric vehicle battery cells on an unassisted mass basis. Even the fattest foods known to culinary science fail to surpass the raw chemical density stored in refined prehistoric crude.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
