How to Calculate a Car's Fuel Consumption per 100 Kilometers?

[OEva]

Calculation method for a car's fuel consumption per 100 kilometers: Fuel consumption per 100 kilometers equals fuel consumption (liters) divided by travel distance (kilometers) multiplied by 100. The fuel consumption per 100 kilometers indicated in the manuals of domestic cars is generally the constant-speed fuel consumption. Constant-speed fuel consumption refers to the fuel economy indicator when the car is driving at a constant speed on a good road surface. Several key technologies related to fuel consumption include three main aspects: 1. The relationship between vehicle weight and fuel consumption is directly proportional. For every 10% reduction in vehicle weight, fuel consumption will also decrease by several percentage points; 2. Car design: a smaller aerodynamic drag of the car body will significantly reduce fuel consumption, and the relationship between these two is also directly proportional; 3. Driving conditions are an important factor affecting fuel consumption.

[AlexandraMarie]

I think calculating a car's fuel consumption per 100 kilometers is quite simple, and the key is relying on actual data. First, fill up the tank until the pump automatically stops, and note the odometer reading, say 1000 kilometers. Then drive for a few hundred kilometers—the longer the distance, the more accurate the result. Next, refuel until the pump stops again and check how many liters were added. Finally, divide the liters added by the kilometers driven and multiply by 100. For example, if you added 10 liters and drove 200 kilometers, 10 divided by 200 gives 0.05, then multiplied by 100 equals 5 liters per 100 kilometers. After years of driving, I've found that road conditions and driving habits have a big impact. Driving steadily on highways can save fuel, while stop-and-go traffic increases consumption. Regularly calculating your fuel consumption can help you save money—it only takes a few minutes each month. I recommend keeping records in a notebook or a mobile app.

[Pamela]

As a car owner, calculating fuel consumption isn't difficult. The steps include: noting the current mileage after filling up the tank, for example, 5,000 kilometers; driving normally for commuting or long-distance trips; driving for about a week, covering, say, 300 kilometers; then filling up the tank again, making sure not to miss recording the amount of fuel added, such as 15 liters; the formula is (fuel added / kilometers driven) × 100 = (15/300) × 100 = 5 liters per 100 kilometers. I always remind beginners not to rely solely on the dashboard display, as it might not be accurate. Cold starts in winter consume more fuel, and using air conditioning in summer also increases consumption. Calculating it clearly can help you reduce expenses and be more environmentally friendly.

[CarlosRose]

Simply put, fuel consumption is calculated based on the amount of fuel refilled and the distance traveled. The process involves three steps: fill up the tank and record the starting mileage; drive for a period; then refill the tank and measure. The formula is: (Fuel refilled ÷ Kilometers driven) × 100. Example: If your mileage is 10,000 km when you fill up, drive 300 km, and then use 12 liters to refill, the fuel consumption is (12 ÷ 300) × 100 = 4 liters/100 km. Ensure consistent mileage units to avoid calculation errors. Vehicle conditions like low tire pressure can increase fuel consumption, so regular calculations help monitor vehicle health.

[VonGage]

I learned this fuel consumption calculation method from an experienced driver. First, fill up the tank until the pump automatically stops, and record the mileage, say 8000 km; then drive normally for 150 km; return to refill the tank and note the fuel amount, for example, 9 liters; calculate: (9 ÷ 150) × 100 = 6 L/100km. The key is to use the refill amount rather than the displayed fuel consumption. I make it a habit to check the data before driving—if it's high, I inspect the air filter or spark plugs. Knowing the actual fuel consumption helps me drive more economically, like gently pressing the accelerator or cruising on highways, which saves a lot of money.

[Cunha]

Calculating fuel consumption is very practical, and I often use it to monitor my car. Method: Fill up the tank and note the mileage, for example, the odometer shows 3000 km; drive for a few days or run 100 km; then fill up the tank again and measure the fuel used, such as 5 liters; the formula is (fuel used / distance traveled) × 100 = (5 / 100) × 100 = 5 liters per 100 km. The more frequently you calculate, the more accurate it is. In summer, long trips tend to have lower fuel consumption, while short city trips increase fuel consumption. Keep a record in a diary, and fix any issues promptly to save money and ensure safety.