How to Calculate Average Fuel Consumption?

[DiTimothy]

Average fuel consumption is calculated by dividing the actual fuel consumption by the actual distance traveled, i.e., fuel consumption per 100 kilometers equals fuel consumption (liters) divided by distance traveled (kilometers) multiplied by 100. Average fuel consumption refers to the amount of fuel used by a vehicle per unit distance traveled, commonly expressed in liters per 100 kilometers. Fuel consumption per 100 kilometers refers to the average fuel consumption of a car traveling on the road per 100 kilometers. There is also instantaneous fuel consumption, which indicates the fuel consumption at a specific moment. This type of fuel consumption varies greatly, reaching over ten liters per 100 kilometers during acceleration and dropping to five or six liters per 100 kilometers during high-speed cruising.

[KayleeRose]

I see many people want to know how to calculate average fuel consumption. The simplest method is to record the mileage and fuel amount when refueling. For example, if the odometer shows 2000 km after a full tank this time, and it displays 2400 km at the next refueling with 40 liters added. 40 liters were used for 400 km, divide 40 by 400 and multiply by 100 to get 10 L/100 km, which is the average fuel consumption for this period. When I calculate fuel consumption myself, I keep all gas station receipts and use a dedicated notebook to record data. Finally, I sum up the annual fuel volume and total mileage to calculate a more accurate comprehensive fuel consumption. The data calculated this way is much more accurate than the car's onboard computer, and it also shows the impact of using air conditioning in different seasons.

[VioletLynn]

Calculating fuel consumption is actually quite simple. First, fill up the tank until the fuel pump automatically stops, and record the mileage or reset the trip meter. After running through a full tank, refill it again and note the new mileage and the amount of fuel added. Divide the fuel amount by the difference in mileage between the two fill-ups, then multiply by 100 to get the fuel consumption per 100 kilometers. For example, if the mileage was 8,000 km at the last fill-up and 8,400 km at the current fill-up, with 36 liters of fuel added, the fuel consumption per 100 km would be (36 ÷ 400) × 100 = 9 liters. I think it's best to calculate it several times to get an average, as fuel consumption can differ by 2-3 liters between city traffic congestion and highway driving.

[AsherDella]

To calculate your car's average fuel consumption, simply record the mileage and fuel amount each time you refuel. For example, if your current refuel shows 5,000 km on the odometer, and at the next refuel it's 5,400 km with 35 liters added. These 35 liters covered 400 km, so the fuel consumption per 100 km is (35÷400)×100=8.75 liters. I use my phone's memo app to track this data and summarize it every six months. Avoid waiting until the tank is completely empty to refuel to prevent inaccurate data.

[JulianLee]

Here's how I calculate fuel consumption: Fill up the tank and note the mileage A. After using half a tank, refuel and record the mileage B and the amount of fuel added C. Apply the formula (C÷(B-A))×100 to get the fuel consumption per 100 kilometers. For example, if you drive 300 kilometers and add 25 liters of fuel, it's 8.33 liters per 100 kilometers. I make it a habit to calculate this once a month, and keeping records for three consecutive months can show the average trend. Using the heater in cold weather increases fuel consumption, as does using the air conditioning in summer. These factors should be considered when recording data.

[VonJasper]

The key to calculating average fuel consumption is to record precise data when refueling to full. First, take a photo of the odometer when the fuel pump clicks off. Next time when refueling to full, take another photo and note the amount of fuel added. The difference between the two odometer readings is the distance traveled. Divide the fuel amount by the distance traveled and multiply by 100 to get the fuel consumption per 100 kilometers. It's recommended to calculate a long-term average using ten consecutive sets of data to filter out single-trip errors. I calculate a fuel consumption value before each long trip and again upon return, which clearly shows the impact of tire pressure changes on fuel efficiency.