Suppose that a new gasoline engine has been invented which can operate at the maximum thermodynamic efficiency (rather than the 25% or so which characterize most realistic engines). The burned fuel reaches about 2100 degrees C inside the engine and a 50 L gas tank has about 2 GJ of fuel energy. If the engine must supply 30 hp to keep the car at a steady speed on the highway, how long will a tank of gas last?

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.