What is the normal engine speed when driving on the highway?

[McChase]

When driving on the highway, the engine speed should generally be between 1000 and 3500 RPM. Around 3000 RPM, the engine outputs the maximum torque, after which it becomes inversely proportional to the driving speed. Maintaining around 3000 RPM is ideal. Details are as follows: During normal use, it is generally recommended to maintain around 3000 RPM. Avoid situations of low gear with high speed or high gear with low speed. Between 2000 and 3000 RPM, low gear with high speed makes the engine work harder but consumes more fuel, which is better for climbing hills. High gear with low speed strains the engine, and prolonged use can damage it, though it may save a little fuel. This can harm the engine. While driving, the optimal engine speed for most fuel-injected cars is around 2200 to 2500 RPM. Regardless of the gear, try to keep the engine speed around 2200 to 2500 RPM. Too low a speed results in insufficient driving power, higher fuel consumption, and potential engine damage. Too high a speed increases unnecessary fuel consumption and can also damage the engine. The most fuel-efficient driving condition is maintaining a constant speed in a straight line. The most fuel-efficient speeds are: 60 to 80 km/h for small-displacement cars and 80 to 100 km/h for medium-displacement cars. When shifting gears, slightly increase the throttle a bit more than during normal driving to raise the tachometer to just above 2500 RPM. If shifting below 2000 RPM, the speed will drop further after shifting, creating a feeling of gear disengagement, which actually consumes more fuel.