First of all, we need to understand the relationship between gear and speed. When our manual car is driving, it always changes from the lowest gear to the highest gear, and the speed is gradually improved. Every gear basically corresponds to the necessary speed range, so you can only reach this level with this gear. Why shift depends on the speed: 1. If you want to pursue acceleration performance and don't care about fuel consumption, then there is nothing wrong with shifting gears at 3500 or even 4000. However, after shifting gears at this time, before lifting the clutch, give some oil lightly, and then completely loosen the clutch after the engine speed rises to 2500 rpm, otherwise there will be a sense of frustration. 2. Considering the most economical fuel consumption and no damage to the engine, the optimal shift speed of 1.6MT Xiaoming is 2285 rpm (this can ensure that the engine will keep the speed of 1500 rpm when shifting to the next gear). 3. Follow the lifestyle of first gear. Cars that drive for a long time and a short distance should drive at low speed and high speed regularly to avoid carbon deposition in the engine (where the valves and injectors are located). If you follow the lifestyle of Class Two, you don't have to do this.