What RPM is the Most Fuel-Efficient?
2 Answers
When driving, the engine speed of a general fuel-injected car is most suitable at around 2200-2500 RPM. Below are the functions of car RPM and tips for saving fuel: Functions of Car RPM: The function of car RPM is to promptly reflect the operating condition of the engine, allowing the driver to better coordinate the transmission gear and throttle position, keeping the car in the optimal working state to reduce fuel consumption and extend the engine's lifespan. Tips for Saving Fuel: Maintaining the optimal speed is the most fuel-efficient driving state, which is steady, straight-line driving. The most fuel-efficient speed for small-displacement cars is 60-80 km/h, while for medium-displacement cars, it is 80-100 km/h. Avoid hard braking—if you need to stop ahead, you should release the throttle in advance and decelerate by coasting in gear, rather than rushing to the stop and braking hard. Braking actually consumes precious gasoline; the harder you brake, the more you waste.
I've been driving manual transmission cars for over a decade, and I find the most fuel-efficient RPM range to be around 2000 to 2500. I remember when I used to take long trips in my old Santana, maintaining this range could save me quite a bit on fuel, extending my mileage by dozens of kilometers. The reason is that the engine operates with less burden at these RPMs, and the fuel burns more completely, unlike when revving high which consumes more fuel. You should avoid stomping on the accelerator for sudden acceleration. On highways, maintain a steady speed between 60 to 80 km/h to keep the transmission in good sync. Also, pay attention to your car's condition, like checking if the tire pressure is adequate and avoiding overloading, as these small things affect fuel consumption. Once you develop these habits, your wallet will thank you.
