Sylvie Willis
Fuel consumption is a measure of how much fuel a vehicle uses at a certain distance, which can be calculated in litres per kilometre or litres per 100 kilometres. This can be calculated manually using a formula or by using an online fuel consumption calculator. There are many factors that can affect a car's fuel consumption, such as the type of car, the way it is driven, and the type of fuel used. By keeping records of distances and fill-ups, you can calculate your fuel use over time to understand how much fuel you use on average.
How much fuel can a car use?
| Characteristics | Values |
|---|---|
| Average fuel consumption per 100km | 6-10 litres |
| Fuel consumption calculation | Fuel used/Distance travelled |
| Fuel economy | Miles per gallon (MPG) or kilometres per litre (kmpl) |
| Factors affecting fuel consumption | Driving style, vehicle maintenance, tyre pressure, motor oil, vehicle weight, aerodynamics, route |
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What You'll Learn
Fuel consumption formula
Fuel consumption is a measure of how much fuel a vehicle burns per unit of distance travelled, for example, in litres per kilometre (L/km) or litres per 100 kilometres (L/100km).
To calculate fuel consumption, you can use the formula:
Fuel consumption = Distance travelled ÷ Fuel used
For example, if a car travels 1320 km using 100 litres of fuel, its fuel consumption is:
Fuel consumption = 1320 km ÷ 100 L = 0.07576 L/km
This can also be converted to the more typical unit of litres per 100 kilometres by multiplying the value by 100 km/100 km:
Fuel consumption = 0.07576 L/km x (100 km/100 km) = 7.576 L/100 km
Alternatively, fuel consumption can be calculated by dividing the distance driven by the fuel used, which gives the number of miles or kilometres per gallon or litre of fuel. For example, if a car travels 335 miles using 12 gallons of fuel, its fuel consumption is:
Fuel consumption = 335 miles ÷ 12 gallons = 27.9 miles per gallon (mpg)
If using kilometres and litres, the fuel used can be divided by the kilometres travelled, and then multiplied by 100 to get litres per 100 kilometres:
Fuel consumption = (Fuel used ÷ km travelled) x 100
It is important to note that the accuracy of fuel consumption calculations depends on starting with a full tank and refilling the tank completely when measuring fuel used. Additionally, factors such as vehicle type, engine size, aerodynamics, tyre pressure, and maintenance can all impact fuel consumption.
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Fuel economy
There are several ways to calculate fuel economy. One method is to keep track of distances travelled and fuel fill-ups to calculate fuel use over time. This can be done manually by recording mileage and fuel usage in a notebook kept in the glove compartment. Alternatively, modern cars are often equipped with a trip computer that automatically records, calculates, and displays the distance travelled, average speed, average fuel consumption, and instant fuel consumption.
Another method is to use a fuel consumption calculator, which estimates fuel costs based on fuel efficiency, distance, and fuel price. This can be done using an online calculator or a manual calculation. The basic formula for calculating fuel consumption is to divide the amount of fuel used by the distance travelled. For example, if a vehicle consumes 100 litres of fuel to travel 1320 km, the fuel consumption is calculated as follows:
> Fuel consumption = Fuel used / Distance travelled = 100 L / 1320 km = 0.07576 L/km
It is important to note that fuel economy figures provided by manufacturers are often obtained under ideal conditions and may not accurately reflect real-world driving. Additionally, factors such as driving habits, vehicle maintenance, tyre pressure, and the use of accessories can impact fuel economy.
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Fuel efficiency
Fuel economy and efficiency vary depending on the vehicle's tire design, transmission structure, and engine. For instance, a small city hatchback should be able to achieve an average fuel consumption of around six to seven litres per 100km, while a full-sized family SUV will use closer to 10 litres per 100km. Additionally, heavier cars use more fuel than lighter cars, so reducing a vehicle's weight can improve efficiency.
There are several ways to improve fuel efficiency. For example, engine downsizing involves using a smaller engine with a turbocharger to maintain power, resulting in superior fuel efficiency and improved handling and performance. Gasoline Direct Injection (GDI) systems can also improve engine efficiency and reduce greenhouse gas emissions by increasing the pressure of the air coming into the engine. Using lightweight materials in car parts can also enhance fuel efficiency.
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Fuel costs
For example, if you travelled 620km and used 53 litres of fuel, your fuel consumption would be 8.5 litres per 100km (53 / (620/100)). This can also be calculated as kilometres per litre by dividing the distance travelled by the litres of fuel used (620 / 53 = 11.7km per litre).
Fuel efficiency and, therefore, fuel costs can vary depending on several factors. The type of car is a significant factor, with small city hatchbacks achieving better fuel efficiency (around 6-7 litres per 100km) than mid-sized SUVs (8-9 litres per 100km) or full-sized family SUVs (around 10 litres per 100km). Hybrids can have even lower fuel consumption in urban settings than on the highway. Additionally, the way a car is driven can impact fuel efficiency, with aggressive driving and frequent stops increasing fuel consumption.
There are several ways to improve fuel efficiency and reduce fuel costs. Maintaining proper tyre pressure can reduce fuel consumption by up to 3%, and using the manufacturer's recommended grade of motor oil can improve gas mileage by 1-2%. Removing unnecessary accessories and cargo from the roof of the car can reduce drag and improve fuel efficiency. Additionally, planning routes carefully to include the fewest stops and diversions and taking highways instead of local routes can help maximize fuel efficiency.
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Improving fuel economy
Fuel consumption is a measure of how efficiently a vehicle uses fuel, often quantified in miles per gallon (MPG) or kilometres per litre (kmpl). The way a car is driven has a huge effect on its average fuel consumption. For example, rapid acceleration and hard braking can lower gas mileage by 10% to 40% when driving in the city and 15% to 30% on highways.
- Maintain a steady speed: Driving at a steady speed of 50-90 km/h on the highway is best for optimal fuel economy. Driving faster than 80 km/h with the windows down creates a lot of wind resistance, increasing fuel consumption. Driving slower than 50 km/h will cause the engine to drop to a lower gear, using more fuel.
- Use cruise control: Using cruise control helps to maintain a constant speed, reducing rapid acceleration and hard braking, which waste gas.
- Avoid idling: Idling in an immobile car for more than 10 seconds can waste up to a quarter to half a gallon of gas per hour.
- Reduce weight: Every extra 50 kg in the car increases fuel consumption by 2%.
- Keep tyres inflated: Underinflated tires can cause excessive heat, leading to blowouts and rollovers.
- Use lightweight rims and LRR (low rolling resistance) tires: Reducing unsprung weight improves fuel economy and handling.
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Frequently asked questions
You can calculate your car's fuel consumption by dividing the litres of fuel used to fill up the tank by the distance travelled between fill-ups and multiplying by 100. This will give you a figure in litres per 100 km. You can also do this calculation in kilometres per litre by simply dividing the distance travelled by the litres of fuel used.
Fuel efficiency is a measure of how efficiently a vehicle uses fuel, or how far a vehicle can travel using a particular amount of fuel. This can be calculated by taking the reciprocal of your vehicle's fuel consumption.
A car's fuel consumption will be influenced by the way it is driven, the type of fuel, and the car's maintenance. For example, fixing a faulty oxygen sensor can improve mileage by up to 40%, and properly inflated tires can reduce fuel consumption by up to 3%.
You can calculate the cost of fuel for a trip by using a fuel cost calculator, which estimates the cost based on the distance travelled, the fuel efficiency of the car, and the price of fuel.
The average fuel consumption of a car depends on the type of car. A small city hatchback may achieve around 6-7 litres per 100 km, while a full-sized family SUV will likely use closer to 10 litres per 100 km. Manufacturer-supplied figures can be used to compare models, but real-world fuel consumption may differ.
