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Otto cycle internal combusion engines are horribly inefficient! I think the maximum ideal energy efficiency is in the 50%-60% range just for the combustion cycle.By the time you add in the real-world factors such as friction, you are talking someting like 35% efficiency just to move the pistons, and maybe 15% energy efficiency from the potential energy of the fuel to the actual work done by the wheels against the pavement.
Otto cycle internal combusion engines are horribly inefficient! I think the maximum ideal energy efficiency is in the 50%-60% range just for the combustion cycle.
By the time you add in the real-world factors such as friction, you are talking someting like 35% efficiency just to move the pistons, and maybe 15% energy efficiency from the potential energy of the fuel to the actual work done by the wheels against the pavement.