Find out how many times 800 is 100,800 ÷100 = 8.

Find out how much oil you need to drive 800 kilometers, 8x8=64 liters.

800÷ 100x8=64 liters.

Driving 800 kilometers consumes about 64 liters of fuel.

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It can be tested on the road or chassis dynamometer, and then the fuel consumption per 100 kilometers can be obtained by "flowmeter method" or "carbon balance method".

Passenger car fuel consumption test method adopts vehicle speed of 90km/h and120km/h; In the fuel consumption test method of commercial vehicles, the vehicle speed starts from 20km/h, and the vehicle speed is evenly selected at the integer multiple of vehicle speed 10km/h until it reaches 90% of the maximum vehicle speed, and at least five test vehicle speeds are measured. When testing roads, it is necessary to follow the national standards such as test conditions, test methods and test road selection.