Why petrol is so addictive that it's hard to give-up

The reason why petroleum-based fuels are so difficult to replace with alternatives like batteries and hydrogen comes down in large part to the incredible amount of energy they can deliver from a small package.

Energy density and the cost, weight, and size of onboard energy storage are important characteristics of fuels for transportation. Fuels that require large, heavy, or expensive storage can reduce the space available to convey people and freight, weigh down a vehicle (making it operate less efficiently), or make it too costly to operate, even after taking account of cheaper fuels. Compared to gasoline and diesel, other options may have more energy per unit weight, but none have more energy per unit volume.


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