1, it is the most economical to choose the refueling time reasonably, because gasoline is also a liquid. Considering that the temperature is low in the morning or evening, the volume of gasoline will also decrease, and when the temperature is high at noon, the volume of gasoline will also increase with the increase of temperature. We generally refuel by volume, not by weight. When you refuel in the morning or evening, the same volume of oil will be more than at noon.

2. The higher the gasoline label, the better. Even an advanced car doesn't mean that the standard oil must be improved. The higher the gasoline grade, the worse the natural ignition characteristics, and then the more fuel is consumed, so it is a waste of gasoline to use high-grade gasoline for family cars with low displacement and low car price.