In the past, the average fuel consumption was 7.3, but now it is 5. 1. Why?

The current fuel consumption is 7.3, and the current fuel consumption is 5. 1, mainly because my driving habits are getting better and better, the road conditions are getting smoother and smoother, and there are fewer and fewer traffic lights, so the fuel consumption of the car will be reduced. These are all normal. One is the body. If it used to be, it is now in an empty race state, which will also have a certain impact on the fuel consumption of the car, so it still depends on comprehensive judgment in many aspects.