What is the formula for calculating car fuel consumption?

[DelJuliette]

Car fuel consumption per 100 kilometers = Volume of a certain amount of fuel (liters) ÷ Distance the car can travel with that amount of fuel (kilometers) × 100. Below is a detailed introduction about car fuel consumption per 100 kilometers: 1. Overview: Fuel consumption per 100 kilometers refers to the amount of fuel consumed by a vehicle traveling 100 kilometers on the road at a certain speed. It is a theoretical indicator for vehicles. The fuel consumption per 100 kilometers is a value measured by manufacturers in an objective environment using a dynamometer installed on the vehicle's chassis, converted into speed parameters, and then calculated by specifying the speed to derive the theoretical experimental fuel consumption data per 100 kilometers for the model. 2. Others: Since most vehicles approach their most economical speed at 90 kilometers per hour, most of the officially published theoretical fuel consumption data is usually the fuel consumption per 100 kilometers at 90 kilometers per hour.

[SanVera]

When I calculate fuel consumption myself, I make it a habit to record the time and mileage every time I refuel. The specific formula is: fuel consumption equals the amount of fuel added divided by the kilometers driven, then multiplied by one hundred, with the unit being liters per hundred kilometers. For example, if I start from zero kilometers with a full tank, drive five hundred kilometers, and then refill with forty liters of fuel, the fuel consumption would be forty divided by five hundred multiplied by one hundred, which equals eight liters per hundred kilometers. This method is simple and practical, requiring no high-tech tools—just a notebook to keep track. However, it's important to note that multiple tests are needed for accuracy, as different road conditions can affect the results. Driving in the city with frequent traffic jams might result in higher consumption, while highway driving tends to be much lower. I believe regularly monitoring fuel consumption can help save some money on fuel, and developing this good habit can save hundreds of dollars a year.

[VonReed]

As a frequent user of car apps, I find calculating fuel consumption quite straightforward: it's simply the amount of fuel consumed divided by the total distance driven, then adjusted to the standard unit of liters per 100 kilometers. Just input the refueling amount and mileage in the app, and it automatically calculates the result, saving time and effort. However, I've also noticed a few key points: during testing, ensure the fuel tank is consistently full to avoid mid-way refueling; additionally, wind speed and air conditioning usage can slightly affect the data, so it's best to take measurements in different seasons and average them out. Knowing this formula helps better assess a car's performance—for example, my old car now reaches 10 liters, signaling it's time for maintenance. Using navigation apps to assist with recording data can also improve accuracy in daily use.

[EmersynLee]

Having driven for decades, I calculate fuel consumption with a simple trick: fill up the tank, reset the odometer, run until about half empty, then refill to full. Divide the second refill amount by the mileage difference before and after, then multiply by 100 to get liters per 100 km. Remember to choose long-distance routes (e.g., over 200 km) for accuracy—short trips skew results. Cold weather increases fuel consumption, so spring/autumn tests are more reliable. This formula helped me identify bad habits like hard braking (which burns extra fuel). Adjusting these saved me significant money annually.