What is the normal engine RPM when driving at 120 km/h on the highway?

1 Answers
DeDelaney
07/29/25 8:19pm
When driving at a high speed of 120 km/h, the engine RPM is generally around 3400 rpm. Here is some relevant information about engine RPM: 1. The relationship between vehicle speed and transmission: Vehicle speed = recommended engine RPM * transmission speed ratio * tire circumference. When a car is moving at high speed, lower engine RPM results in better fuel efficiency. However, fuel consumption evaluation isn't solely based on this factor. A good engine paired with an excellent transmission makes for a truly fuel-efficient and enjoyable driving experience. 2. RPM requirements for gear shifting: Different engines have different requirements. For modern passenger cars, the recommended shifting RPM is typically between 2500~3000 rpm, as the optimal driving RPM for most cars is around 2000 rpm. Shifting at excessively low RPM will cause the engine to operate at low speeds for prolonged periods, which is not good for the machine and doesn't actually save fuel.
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