Why petrol have more calorific value?

Petrol has a higher calorific value primarily due to its hydrocarbon composition, which consists of long chains of carbon and hydrogen atoms that release a significant amount of energy when combusted. The energy density of petrol is also enhanced by its ability to vaporize easily, allowing for more efficient combustion in engines. Additionally, the structure of petrol allows for a greater number of carbon-hydrogen bonds, which release energy when broken during the combustion process, contributing to its higher calorific value compared to other fuels.