(100/7.89=Total*** how much gas to add)/(100/8.6=How much gas you use per kilometer)=one hundred dollars to run

Calculate how much a kilometer costs: fill up the tank and run 100 kilometers. Refill again. Divide the price of the refilled tank by 100 kilometers, and the result is the average amount of money spent per kilometer.

For example, if a car consumes A liters of fuel and travels N kilometers, then the fuel consumption per 100 kilometers = A ÷ N × 100. Bringing in specific numbers, if a car consumes 4 liters of fuel and can travel 50 kilometers, then the fuel consumption per 100 kilometers of the car = 4 liters ÷ 50 kilometers × 100 = 8 liters per 100 kilometers, and the fuel consumption per 100 kilometers is 8 liters.

Expanded information:

The total price of the 100 kilometers of fuel is calculated as follows:

1, Car line 100 kilometers of fuel consumption × the prevailing fuel price = 100 kilometers line fuel price. For example: 8.3L (100 kilometers of fuel consumption) × 7 (fuel price) = 58.1 yuan.

2, refueling amount ÷ driving course × 100 = 100 km fuel price. For example: 360 (empty tank refueling price) ÷ 600 (driving kilometers) × 100 = 60 yuan.

With this method the measured value is closer to the actual value. The U.S. Society of Automotive Engineers (SAE) developed the SAEJ10926 road cycle test specification, which is widely used. This specification includes four different cycles: urban, suburban, intercity (55Mile/h) and interstate (70Mile/h), and then use this value to calculate the fuel consumption. Calculation formula: X=a*Economic Vehicle Speed/b, with a being the 100-kilometer fuel consumption and b being the measured value.

Baidu Encyclopedia - Fuel Prices