Regan Brown
With gas prices on the rise, it's more important than ever to understand your car's fuel economy. Knowing your car's MPG (miles per gallon) can help you determine if your car is a gas guzzler and eating up your cash. Calculating your car's MPG can be done in several ways, including using a fuel economy widget or a gas mileage calculator. You can also calculate it manually by filling up your tank, recording the mileage, driving as you normally would, and then filling up your tank again and recording the new mileage and gallons used. Divide the miles travelled by the gallons used, and you have your MPG.
| Characteristics | Values |
|---|---|
| Calculating fuel economy | Divide miles travelled by the amount of gallons used to refill the tank |
| Improving fuel economy | Remove unnecessary weight from the vehicle, use the recommended motor oil, keep windows up during highway driving, avoid using roof or bike racks, limit AC usage |
| Tools | Fuel economy widgets, fuel economy websites, gas mileage calculators, trip odometer |
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What You'll Learn
Calculating miles per gallon (MPG)
Calculating your car's fuel efficiency, or miles per gallon (MPG), is a great way to understand your vehicle's performance and keep costs down. There are several ways to calculate MPG, and many modern vehicles will have a digital readout on the dashboard, displaying the MPG. However, these readouts are not always accurate, and it is useful to know how to calculate MPG yourself.
Firstly, you need to fill up your tank. Note the mileage on your odometer before you drive away from the pump. Some vehicles have a trip odometer that can be reset to zero, which makes it easier to calculate the miles travelled since your last refill. If not, simply make a note of the mileage before you start driving.
Drive as you normally would and let the tank deplete to half full, or until you need to refill. When you refill your tank, make a note of the number of gallons it took to refill. If you have forgotten to check this, you can estimate by dividing your tank capacity by the amount of fuel you added (e.g. 1/4, 1/2, or 3/4).
Now, divide the miles travelled by the gallons used. This will give you your MPG. For example, if you travelled 312 miles and used 16 gallons of fuel, your MPG is 19.5.
You can also calculate MPG by dividing the total miles run on a full tank of fuel by the capacity of the fuel tank. For example, if your car can travel 400 miles on a full 15-litre tank, the calculation would be 400 x 0.22 (as 1 litre = 0.22 gallons) = 88 MPG.
It is worth noting that your MPG may vary depending on driving conditions and style. For example, driving with open windows or using a roof rack can decrease fuel efficiency due to increased drag. Similarly, using the air conditioning can reduce a vehicle's fuel economy by up to 25% in hot climates.
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Using a fuel economy widget
The US Environmental Protection Agency (EPA) offers fuel economy widgets that provide access to official EPA fuel economy ratings for vehicles dating back to the 1984 model year. This widget also displays a new fuel-saving tip each week and provides links to additional tips and resources on fueleconomy.gov. This can be a valuable tool to learn more about your vehicle's fuel efficiency and explore ways to optimise it.
Another option is to use the Fuelly widget, which helps track and compare your car's MPG (miles per gallon). By inputting your vehicle's details and tracking your fill-ups, Fuelly calculates your fuel expenses and real gas mileage. This information can help you monitor changes in your driving habits and keep an eye on your vehicle's performance and health.
Some widgets also offer comparisons between different types of vehicles, such as small cars, sedans, hatchbacks, SUVs, and more. This feature can be useful if you're considering purchasing a new car and want to make a more informed decision based on fuel economy.
Overall, fuel economy widgets are a convenient and accessible way to stay informed about your car's fuel efficiency, offering insights that can help you optimise your driving habits and choose the most cost-effective vehicle options.
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Improving fuel efficiency
Driving Habits
- Maintain a steady speed: After reaching 45-50 mph, your car begins to lose fuel efficiency. Driving above these speeds is like paying more for gas. It is best to stick to the speed limit and use cruise control when possible. Rapid acceleration and hard braking can decrease fuel efficiency by 10% to 40%.
- Look ahead and drive smoothly: Avoid slamming on the brakes by looking ahead and planning your next move. Instead of coming to a complete stop, try slowing down as you approach a red light or a hill. Maintaining a higher gear when appropriate can also help reduce fuel consumption.
- Reduce speed on highways: Driving with the windows down at speeds faster than 80 km/h causes a lot of wind resistance, increasing fuel consumption. It is more fuel-efficient to drive with the windows up and the air conditioning on at such speeds.
- Remove unnecessary items: Items like forgotten backpacks, sports equipment, and extra books can add up to 100 pounds, reducing your fuel efficiency. Clear out the clutter from your car and remove add-ons that increase wind resistance, such as bike racks.
Vehicle Maintenance
- Check your tire pressure: Underinflated tires can increase fuel consumption by up to 10%. Check your owner's manual or the sticker on the inside of the driver's door for the correct PSI. Regularly check your tire pressure, especially during seasonal changes, to ensure optimal inflation.
- Perform regular maintenance: Dirty air filters, spark plugs, and connections can negatively impact your fuel economy. Keep your car well-maintained to ensure optimal fuel efficiency.
- Reduce wheel weight: Lightweight rims and low rolling resistance (LRR) tires can improve fuel efficiency and handling. However, LRR tires may have slightly worse traction.
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Odometer readings
There are two types of odometers: mechanical and electronic. Mechanical odometers are the older type, and they are slightly harder to read as the numbers can be off-centre. They are also easier to tamper with. Electronic odometers are newer, digital displays that are run by the electrical system. They are more accurate and harder to alter.
To calculate your car's fuel efficiency using odometer readings, start by filling up your gas tank. Record your car's mileage before you do any driving. Then, drive your car normally until the gas tank is less than half full. Once the tank is low, fill it up again and write down how many gallons of gas it took to fill it up. Also, write down your car's new mileage before you leave the pump. Finally, use the formula: miles per gallon = (mileage B - mileage A) ÷ gallons.
To get the most accurate reading, try to record the mileage for an entire tank of fuel. You can also perform the test several times to see a better average. It's important to refill your tank completely when calculating your fuel consumption. Otherwise, you won't know how much gas your car has used since your last tank.
It's also possible for the odometer to show the wrong measurement. If you have a mechanical odometer, you'll want to watch it periodically to ensure it is recording the mileage correctly. If you measure the distance you've driven, the odometer should accurately report it. If the odometer isn't working correctly, even by a little, the mistake can quickly add up.
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Fuel-efficient vehicles
Fuel efficiency is a critical factor in determining the cost of running your vehicle. With gas prices rising, it is important to know how to calculate your car's fuel efficiency, also known as miles per gallon (MPG) or kilometres per litre (KPL). This will help you understand if your car is a fuel-efficient vehicle or a "gas guzzler".
Firstly, fill up your tank at a gas station. Note down the mileage on your odometer before you start driving. Drive as you normally would until your tank is less than half-full. Fill up your tank again and record the amount of gas it took to refill. Divide the miles driven by the gallons used to get your MPG. For example, 312 miles driven divided by 16 gallons of fuel equals 19.5 MPG.
You can also use online tools to calculate your fuel efficiency. Websites such as fueleconomy.gov offer widgets to compare the fuel economy, fuel costs, and safety ratings of new and used cars. These tools allow you to search by MPG, price, make, body style, and more.
There are several ways to improve the fuel efficiency of your vehicle. Maintaining your vehicle by using the recommended motor oil, keeping the engine properly tuned, and regularly checking the air filters and oxygen sensor can help improve fuel efficiency by 1-2%. Removing unnecessary weight from your vehicle can also help, as lighter vehicles require less fuel to move. Additionally, driving habits such as keeping windows rolled up on highways, minimising the use of air conditioning, and reducing acceleration and braking can all contribute to better fuel efficiency.
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Frequently asked questions
You can check your car's fuel economy by filling up your tank, recording the mileage, and then driving until your tank is half-empty. Fill up your tank again and record the mileage and the amount of fuel needed to refill the tank. Divide the miles travelled by the amount of fuel used to get your car's average miles per gallon (MPG).
There are several ways to improve your car's fuel economy. You can try to remove any unnecessary weight from your car, as lighter cars are more fuel-efficient. You can also try to reduce drag by rolling up your windows, removing roof or bike racks, and avoiding driving with the air conditioning on unnecessarily high. Additionally, you can use the recommended motor oil and keep your engine properly tuned.
Once you know your car's MPG, you can calculate the cost of a trip by multiplying the MPG by the price of fuel per gallon. For example, if your car gets 30 MPG and fuel costs $4 per gallon, your trip will cost $0.133 per mile.
