Katerina Swanson
With the ever-increasing price of fuel, it's becoming more important to understand how to measure car fuel economy. Fuel economy, or fuel efficiency, is a measure of how efficiently a vehicle uses fuel, typically in miles per gallon (MPG) or kilometres per litre (kmpl). Knowing your car's fuel economy can help you determine if it's a gas guzzler and allow you to calculate how much a rise in gas prices will affect your budget. It can also help you plan future trips and save money on fuel. This article will outline some ways to measure and improve your car's fuel economy.
How to Measure Car Fuel Economy
| Characteristics | Values |
|---|---|
| Carpooling | Carpooling, public transport, or walking/bicycling are the best options for someone looking for the best possible gas mileage, or fuel efficiency. |
| Fuel-efficient vehicle | 4-wheel-drive vehicles tend to be less fuel-efficient than FWD or RWD. |
| Tires | Under-inflated tires can lower gas mileage by 0.3% per PSI drop. |
| Driving speed | According to studies by the U.S. Department of Energy, the optimal speed for fuel efficiency is 55 MPH. |
| Aggressive driving | Aggressive acceleration and braking can have a toll on fuel efficiency. |
| Vehicle maintenance | Keep the vehicle in good shape. Use the recommended motor oil and keep the engine properly tuned. |
| Vehicle weight | Remove unnecessary weight from the vehicle. |
| Aerodynamics | Placing ornaments, ground effects, aerodynamics kits, and airfoils increase the car's drag and make it require more fuel. |
| Air-conditioning | Fuel economy suffers in especially hot climates because of the partitioning of oil required to power the air-conditioning. |
| Route planning | Plan your route carefully to include the fewest stops, diversions, and traffic. Take highways instead of local routes or city streets when possible. |
| Calculating fuel economy | Divide the total miles run on a full tank of fuel by the capacity of the fuel tank to obtain the mileage of the car. |
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What You'll Learn
Calculating fuel consumption
Calculating your car's fuel consumption can help you maximise your fuel efficiency. Here are some steps to calculate your car's fuel consumption:
Step 1: Fill up your tank
Start by filling your tank to the top with gas. This is important because if you don't fill it up completely, you won't know how much gas your car has used since your last refill.
Step 2: Record the mileage
Before you start driving, record the mileage on your odometer. This is called Mileage A.
Step 3: Drive
Drive your car as you normally would until your gas tank is less than half full. Driving at a steady speed of 55 mph can help improve fuel efficiency. Aggressive acceleration and braking can reduce fuel efficiency, so try to avoid these.
Step 4: Refuel and record the data
When it's time to refuel, record the number of gallons or litres it takes to fill up your tank. This is your "Fuel Used". Also, record the mileage on your odometer after refuelling. This is your "Distance Driven".
Step 5: Calculate fuel consumption
Now that you have the data, you can calculate your car's fuel consumption using the formula: Distance Driven ÷ Fuel Used. For example, if your car travelled 1320 km and used 100 litres of fuel, your calculation would be: 1320 km ÷ 100 L = 13.2 km/L.
Step 6: Repeat
To get a more accurate measurement, repeat these steps 2-3 times and average the values.
Other ways to improve fuel efficiency include:
- Using the recommended motor oil
- Keeping the engine properly tuned
- Ensuring proper tyre inflation
- Removing unnecessary weight from the vehicle
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Improving fuel efficiency
There are several ways to improve your car's fuel efficiency. Firstly, you should clear out any unnecessary clutter from your car. Forgetting to remove items like backpacks, sports equipment, and books can reduce your fuel efficiency. Additionally, add-ons such as roof racks or bike racks can increase wind resistance, decreasing fuel efficiency. Therefore, these should be removed when not in use.
Secondly, it is important to maintain proper tyre pressure. Underinflated tyres can increase fuel consumption by up to 10%. Check your owner's manual or the sticker on the inside of the driver's door to find the correct PSI for your tyres. Along with this, make sure to perform regular maintenance on your car. Dirty air filters, spark plugs, and connections can all negatively impact your fuel economy.
Another way to improve fuel efficiency is to drive at a steady speed within the speed limit. Rapid acceleration, aggressive braking, and driving over the speed of 45-50 mph can decrease fuel efficiency. Using cruise control, when possible, can help maintain a constant speed and reduce unnecessary acceleration and deceleration. Additionally, when driving a manual car, maintain a higher gear when appropriate to reduce the number of revolutions per minute (RPM) and lower fuel consumption.
Finally, some other simple tips to improve fuel efficiency include removing unnecessary weight from your car, using the recommended motor oil, and keeping your windows rolled up when driving at high speeds to reduce drag.
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Reducing fuel costs
Firstly, keep your vehicle well-maintained. Regular car servicing is essential to maintaining your engine's fuel efficiency. Engine parts work in tandem, and if not maintained properly, sludge and corrosion will build up, making it difficult for the engine to run smoothly. Using a high-performance engine oil can help reduce friction in the engine, combat sludge, and improve fuel economy. It is also important to keep the engine properly tuned, ensure the oxygen sensor is in good shape, and address any failed emissions tests. Check your air filters regularly to ensure they are not clogged, as this can deprive the engine of proper airflow.
Secondly, ensure your tires are in good condition and properly inflated. Underinflated tires can lower gas mileage and increase fuel consumption. Every 5 PSI drop in tire pressure can reduce fuel efficiency by about 0.3%, and if all your tires are underinflated by 10 PSI, fuel efficiency can drop by up to 10%. Consult your driver's manual or the tire sidewall markings to find the optimal tire pressure.
Thirdly, reduce wind resistance. Open windows, roof racks, and bike racks increase drag, causing the engine to work harder. Driving with the windows down at speeds over 50 MPH (80 km/h) can increase wind resistance and fuel consumption. It is more fuel-efficient to drive with the windows up and use air conditioning when necessary. However, using the AC in hot climates can also decrease fuel economy due to the extra power required to run it.
Additionally, aggressive driving behaviours like rapid acceleration and hard braking can decrease fuel efficiency. Maintaining a constant speed with cruise control can help improve fuel efficiency. When possible, drive at optimal speeds for fuel efficiency, which is typically around 55 MPH (90 km/h). Driving at lower RPMs also helps reduce fuel consumption, so when safe, maintain a higher gear in a manual car.
Finally, reduce the weight of your vehicle. Every extra 50 kg increases fuel consumption by about 2%. Remove unnecessary items from your car, and only keep essential emergency spares. Carpooling can also help reduce fuel costs by sharing the fuel expense with others.
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Impact of car features
The impact of car features on fuel economy is significant. Firstly, the type of vehicle you drive plays a crucial role. Larger vehicles, such as sports utility vehicles (SUVs), inherently consume more energy than smaller cars. Their higher fuel consumption is often exacerbated by their popularity among high-income consumers, who tend to drive them more and over longer distances. This results in a more substantial environmental impact and higher fuel costs for their owners.
Additionally, the engine type and horsepower of your car have notable effects on fuel economy. Choosing a vehicle with a smaller, turbocharged engine can reduce fuel consumption by 2-6%. Turbochargers force air into the engine's cylinders, allowing a smaller engine to produce the same power as a larger one. This not only saves fuel but also reduces carbon dioxide (CO2) emissions by 550-3,860 kg over ten years. Similarly, opting for a vehicle with the appropriate horsepower for your needs can significantly impact fuel efficiency. More powerful engines generally consume more fuel, so selecting a car with excessive horsepower can result in unnecessary fuel costs and emissions.
The presence of certain features, such as a cylinder deactivation system (CDS), can also influence fuel economy. A CDS improves fuel efficiency by shutting down half of the cylinders when the engine's full power is not required, such as during highway or downhill driving. This reduces fuel consumption by 4-10% and can lead to substantial savings in fuel costs and CO2 emissions over time.
Furthermore, specific driving habits and conditions can impact fuel economy. Aggressive driving behaviours, such as rapid acceleration and hard braking, can decrease fuel efficiency by up to 30% on highways and 40% in stop-and-go traffic. Maintaining a steady speed, using cruise control when possible, and adhering to speed limits are more fuel-efficient practices. Additionally, external features like roof racks or bike racks can increase drag, reducing fuel efficiency. Keeping your vehicle well-maintained, ensuring proper tyre pressure, and limiting idling can also positively impact fuel economy.
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Driving habits
Another factor to consider is the weight of the vehicle. Heavier vehicles require more fuel to move, so removing unnecessary weight can improve fuel economy. This includes items such as roof racks, bike racks, and cargo on the roof, which not only add weight but also increase drag, reducing efficiency. Similarly, accessories like aerodynamics kits and spoilers can increase drag and fuel consumption. Properly inflating your tires can also reduce fuel consumption by up to 3%. Under-inflated tires can decrease gas mileage by 0.3% per PSI drop.
The type of vehicle and engine also impact fuel economy. Generally, smaller cars with less powerful engines are more fuel-efficient. For example, a small sedan may have half the fuel cost of a large SUV. Additionally, 4-wheel-drive vehicles tend to be less efficient than FWD or RWD, as powering all four wheels requires more energy. Carpooling or sharing rides can also help improve fuel efficiency, as it reduces the number of vehicles on the road.
Lastly, external factors such as air conditioning and windows can affect fuel economy. Air conditioning can decrease efficiency, especially in hot climates, as it requires more power from the engine. Keeping windows closed on highways can improve efficiency, as open windows increase drag, forcing the engine to work harder.
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Frequently asked questions
You can calculate your car's fuel economy by dividing the distance driven by the amount of fuel used. To get a more accurate reading, it is recommended that you fill up your tank and reset your trip odometer. Then, drive your car until your tank is less than half full. Record the distance driven and the amount of fuel used.
Aggressive driving behaviours such as rapid acceleration and braking can decrease your car's fuel economy. Maintaining a steady speed and avoiding unnecessary stops will help improve fuel efficiency. Additionally, driving at optimal speeds for your vehicle, such as 55 mph for gas vehicles, can also enhance fuel efficiency.
Keeping your vehicle well-maintained can improve its fuel economy. Ensuring your car is in good condition, including proper tyre inflation, a clean air filter, and a well-tuned engine, can all contribute to maximising fuel efficiency. Removing unnecessary weight from your car can also help improve fuel economy.
