
The classification of high, medium, and low-end cars was initially based on factors such as vehicle length, wheelbase, and engine displacement. However, due to factors like extended vehicle length and wheelbase, it is now more reasonable to classify cars based on their price. Cars in each category differ in terms of engine displacement, chassis suspension, design, brand factors, and material quality. More details are as follows: 1. Intermediate cars: The main intermediate cars in the Chinese market include the Buick Excelle GT, Skoda Octavia, Toyota Corolla, Volkswagen Sagitar, Volkswagen Polo, Nissan Tiida, Mazda 3, Ford Focus, and Chevrolet Cruze. 2. Upper-intermediate cars: The main upper-intermediate cars include the Buick Regal, eighth-generation Hyundai Sonata, Nissan Teana, Ford Mondeo, Toyota Camry, Mazda 6, BMW 3 Series, Audi A4, and Mercedes-Benz C-Class. 3. Luxury cars: The main luxury cars in China include the Audi A6L, BMW 5 Series, BMW 7 Series, Mercedes-Benz E-Class, Buick Park Avenue, Toyota Crown, Lexus ES/GS/LS Series, and Volvo S80L.

When I used to drive, I noticed that the car's transmission gears are divided into two states, which is the difference between low and high gears. Simply put, low gears are like sprinting off the starting line—lots of power but not very fast, making them especially useful for climbing hills or starting in snow, where the wheels grip the ground firmly. High gears are like running a marathon—once you reach speed, they're very fuel-efficient. On the highway at 100 km/h, the engine rpm might only be around 2,000, making the engine as quiet as if it were sleeping. In traffic jams, switching between first and second gears is common, while downshifting from fourth to third during overtaking gives an instant burst of power. Experienced drivers know how to flexibly switch gears according to road conditions. On long descents, shifting to a lower gear can even use engine braking to protect the brake pads.

The high and low gears in a car are essentially a matter of gear ratio design in the transmission. Lower gears have larger gear ratios, meaning the engine can generate significant wheel force with minimal rotation, but the speed remains low. Higher gears work the opposite way, with smaller gears driving larger ones, allowing the car to reach high speeds while the engine runs smoothly. I often explain to beginners that it's like riding a geared bicycle—use the smallest gear for uphill climbs and switch to larger gears on flat roads. Although automatic transmission cars don't require manual shifting, they still downshift automatically on steep slopes to ensure sufficient torque. Performance car enthusiasts even modify lower gear ratios specifically to enhance explosive acceleration.

Having driven for over a decade, I believe the essence of gear shifting lies in matching the engine speed. When starting in low gear, I don't mind the RPM soaring to 4000 because the wheels turn slowly but with ample torque. On highways in fifth gear, maintaining around 1500 RPM at 80 km/h is most fuel-efficient. Once on a mountain road, climbing in high gear made the car wheeze as if falling apart, but downshifting immediately brought it back to life. In snowy conditions, starting in second gear ensures stability and prevents tire slippage. Many cars now have ECO mode, which essentially shifts gears earlier to control RPM, but never hesitate to use low gear when climbing hills.


