What is the optimal engine RPM for fuel efficiency?

1 Answers
Ashlyn
07/30/25 8:06am
An engine speed of around 2200-2500 RPM is most fuel-efficient. Below is relevant information about engine speed:1. RPM measurement: Typically measured using a speed sensor that corresponds with the signal teeth on the flywheel to determine engine speed.2. RPM range: During idle, engine speed generally reaches 700-1100r/min. The operating condition at rated power and rated speed is called the rated condition. Rated power isn't the maximum power an engine can produce, but rather the maximum usable limit of effective power determined by the engine's purpose. For the same engine model, the rated power value varies depending on its application. Effective torque also changes with engine conditions. Therefore, the maximum torque a car engine can output and its corresponding speed serve as an indicator for evaluating engine performance.
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