[How to use the fuel consumption calculation tool]

1. Enter "mileage", "refueling amount", and "refueling unit price" when refueling.
2. Tap the "Calculate" button.
3. "Fuel efficiency" and "Gasoline fee" are displayed.
4. Tap ? to save the refueling data.
5. You can check the saved refueling data from "Refueling history".
6. You can delete the refueling data by long-pressing.
7. You can sort by clicking the sort button on the upper right.