What should the RPM be at 70 km/h?
2 Answers
If the speed reaches 70 kilometers per hour, the highest gear should be engaged. Generally, the engine RPM at this speed is around 2000 revolutions per minute, and for some cars, it may even be lower than 2000 RPM. This is because the transmission has more gears. Here is some additional information: 1. When cruising at high speed, the highest forward gear should be engaged to reduce engine RPM and improve fuel economy. 2. Some automatic transmission cars have many gears. Generally, cars with more gears will have very low engine RPM when the highest gear is engaged, which is beneficial for fuel economy. 3. When overtaking, downshifting in advance will increase the engine RPM and wheel torque, allowing for quicker overtaking.
My old manual transmission car runs at about 2300 RPM when cruising at 70 km/h. It really depends on what car you drive, and the gear you're in makes a big difference. Last time I drove my colleague's new CVT car, at the same 70 km/h, the RPM was only 1800, quiet and fuel-efficient. The type of transmission is crucial, cars with more gears generally have lower RPMs. Small-displacement engines tend to run at higher RPMs on highways, especially when the AC is on or going uphill—it can shoot up to over 3000 RPM in no time. Tire size and pressure also affect RPM performance, though these changes are usually too subtle for most people to notice. If the RPM is way off, remember to check the clutch or transmission fluid.
