What is the most commonly used fuel for running automobile engines?

Gasoline is the most commonly used fuel for running automobile engines primarily due to its widespread availability, ease of use, and the design of most passenger vehicles, which are optimized for gasoline engines. Gasoline engines offer good performance characteristics, such as quick acceleration and the ability to operate efficiently at various speeds.

The infrastructure for gasoline distribution is extensive, with gas stations placed conveniently for consumers, further promoting its use as the dominant fuel type in the automotive market. In terms of energy content, gasoline provides a good balance of power and efficiency.

While other fuels like diesel are widely used in certain vehicle types, such as trucks and larger vehicles, and alternatives like natural gas and propane are gaining popularity for their environmental benefits, they still represent a smaller share of the overall vehicle market when compared to gasoline-powered cars. Therefore, within the context of typical passenger vehicles, gasoline remains the fuel of choice for most consumers.