When driving a vehicle with an automatic transmission (AT), engine speed will vary depending on several factors, such as:
* Driving speed: The higher the speed, the lower the engine speed.
* Gear Ratio: Each gear in an automatic transmission has its own gear ratio, which determines how often the engine must rotate to drive the wheels.
* Engine Load: As engine load increases, such as when climbing a mountain or towing, the engine speed also increases.
* Driving Style: Aggressive driving style, such as heavy acceleration or braking, may result in higher engine speeds.
Approximate engine speed when driving at different speeds:
* At a speed of 50 km/h in 4th gear, the engine speed may be around 1500-2000 rpm.
* At a speed of 90 km/h in 6th gear, the engine speed may be around 2200-2500 rpm.
* At 120 km/h in 8th gear (if equipped), engine speed may be around 2500-2800 rpm.
It is important to note that these values are approximate and may vary depending on the specific vehicle model and automatic transmission. Modern automatic transmissions are equipped with advanced control systems that optimize engine speed to achieve the best fuel economy and performance.