What are the four gears of an automatic transmission?

[StellaMarie]

The four letters P, R, N, D represent the gears of an automatic transmission car. Here is relevant information about automatic transmissions: 1. Automatic principle: The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, automatic transmissions consume over 10% more fuel than manual transmissions. Whether manual or automatic, more gears mean better fuel efficiency. 2. Driving techniques: For manual transmission cars, shifting should be done at higher RPMs. Engines are designed to operate at higher RPMs, with parameters like dynamic balance and rotational inertia based on high-speed conditions. Prolonged operation at non-optimal RPMs increases internal component load and wear, often leading to vibrations and knocking, and reduces engine lifespan. Choosing 3000 RPM as the shift point ensures post-shift RPMs around 2300, keeping the engine within a healthy operating range.