Do all fuels release the same amount of energy?

No, not all fuels release the same amount of energy when burned. Different fuels have varying energy densities, which is the amount of energy released per unit of mass or volume. For example, fossil fuels like gasoline and diesel generally have higher energy content compared to biomass or biofuels. Factors such as chemical composition and the presence of impurities also influence the energy output of different fuels.