What Does Car Engine Efficiency Mean?

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Automotive thermal efficiency refers to the ratio between the mechanical work output by the engine and the chemical energy produced by fuel combustion. Below is a partial introduction about automotive thermal efficiency: Introduction: Engine thermal efficiency is one of the indicators used to evaluate engine performance. A simple and straightforward understanding is that the higher the engine's thermal efficiency, the better the fuel economy, the higher the performance, and the better the emissions. Numerical value: When the engine is operating, only a portion of the thermal energy contained in the fuel is converted into propulsion work, while the rest is lost in the form of thermal or kinetic energy. Currently, the thermal efficiency of mainstream engines worldwide mostly ranges between 30%-38%, with some exceptional ones exceeding 40%.