Sylvie Willis
With fuel prices soaring, it's no surprise that fuel efficiency is a priority for many drivers. Fuel efficiency refers to how effectively a car uses fuel, and it's often confused with fuel economy, which is a specific number that shows how far a car can go on a certain amount of fuel. For example, a vehicle with a fuel economy rating of 30 miles per gallon (MPG) can travel 30 miles on a gallon of gas. A car with good fuel efficiency will burn less fuel, reducing emissions and saving you money. So, how do you know if a car is fuel-efficient? You can start by comparing engine specs and vehicle weight, as lighter vehicles require less fuel. You can also calculate your car's MPG by filling up the tank, recording the mileage, driving as normal until it's half-empty, then filling it up again and recording the mileage and gallons used. Divide the miles driven by the gallons used, and you have your MPG.
| Characteristics | Values |
|---|---|
| Fuel economy | Measured by miles per gallon (mpg) or kilometres per litre (km/L) |
| Fuel efficiency | Refers to how well a car uses fuel; a higher fuel economy number indicates better fuel efficiency |
| Vehicle weight | Lighter vehicles require less fuel to move |
| Aerodynamics | Smaller cars are more aerodynamic, increasing fuel efficiency |
| Vehicle type | Electric vehicles (EVs) and hybrids are more fuel-efficient than traditional cars |
| Maintenance | Regular maintenance can improve fuel efficiency |
| Driving speed | Driving at lower speeds can increase fuel efficiency |
| Odometer accuracy | Use "mileage check sections" on freeways or map out an accurate distance to check odometer accuracy |
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What You'll Learn
Compare engine specs and vehicle weight
The engine power-to-weight ratio is a critical performance metric that directly impacts a vehicle's fuel efficiency. This ratio is calculated by dividing the engine's power output (measured in horsepower or kilowatts) by the vehicle's total weight (measured in kilograms or pounds). A higher ratio indicates better performance and fuel efficiency. Lighter vehicles generally have a better power-to-weight ratio compared to heavier vehicles with the same engine power.
To improve a vehicle's power-to-weight ratio, several strategies can be employed:
- Engine Displacement: While larger engine displacements produce more power, they also tend to be heavier. Therefore, optimizing the engine displacement based on the desired balance between power and weight is crucial.
- Forced Induction: Turbochargers and superchargers can significantly increase engine power without a proportional increase in weight, improving the power-to-weight ratio.
- Lightweight Materials: Using lightweight materials such as aluminum or carbon fiber in the vehicle's construction can reduce overall weight and improve the power-to-weight ratio.
- Aerodynamics: Improved aerodynamics reduce drag, enhancing fuel efficiency and overall performance, contributing to a better power-to-weight ratio.
- Transmission Optimization: Choosing a lightweight, high-performance gearbox can optimize power delivery and improve the power-to-weight ratio.
- Chassis and Suspension Optimization: Optimizing the chassis and suspension design can reduce vehicle weight. Advanced suspension systems, such as air suspensions, improve load balancing and reduce the need for extra structural weight.
Additionally, the weight of a vehicle is an important factor in fuel efficiency. Heavier vehicles require more energy to operate, leading to increased fuel consumption and environmental impacts. By reducing the weight of a vehicle, you can improve fuel efficiency, lower operating costs, and reduce emissions. This can be achieved by regularly auditing the vehicle's contents and removing unnecessary items, as well as using lightweight alternatives for storage systems.
When comparing engine specs and vehicle weight for fuel efficiency, it is essential to consider factors such as engine power, vehicle weight, and the power-to-weight ratio. By analyzing these aspects, you can make informed decisions about a vehicle's performance and fuel efficiency.
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Aerodynamic design
Aerodynamics is the study of airflow around a car. The smoother the airflow, the lower the drag, and the less fuel a car burns at a specific speed. This is why carmakers are so keen to develop their vehicles' aerodynamic efficiency—it means they can achieve better gas mileage figures and sell more cars. It's also a lot cheaper for carmakers to improve efficiency with aerodynamics than by expensive weight-saving or costly engine technologies.
The basic shape of a car or truck is the most important factor in its aerodynamic performance. While shapes will evolve, the change isn't likely to be too dramatic. Aerodynamic efficiency is a big factor in reducing costs, both for the individual and the environment.
When fuel efficiency is paramount, designers and engineers can do even better. For example, the Nissan Leaf EV has a 0.29 Cd (coefficient of drag). The Chevrolet Volt plug-in hybrid has a Cd of 0.28. The 2013 Toyota Prius and 2013 Hyundai Sonata hybrids both claim a 0.26 Cd. Even utility vehicles are getting more aerodynamic. The 2013 Hyundai Santa Fe has a flat underbody panel that helps reduce drag by 10%, which contributes to a 0.34 Cd—well below the average for crossovers and SUVs.
Automakers focus on aerodynamics for financial reasons, too. "Aero benefits can almost be cost-free to some extent—just how you bend the metal and how you execute gaps and joints, and a lot of that is design," says Rick Aneiros, Chrysler Group's vice president of Jeep and truck design. "If you're trying to reduce weight by adding expensive exotic materials, that's not easy to do. And improving engine efficiency, that's not easy to do. So the leading strategy is to improve aerodynamics whenever possible."
To improve the airflow around a car, makers can do several things, some of them surprising. These include rounded edges at the front of the vehicle—sharp corners and edges increase turbulence and drag, while smooth edges reduce it. Grill openings can be optimised to reduce turbulence both outside the car and under the hood—some makers have even experimented with adjustable grill slats. Aerodynamic wheel shapes can also help—the 2013 Ford Atlas pickup concept vehicle had active wheel shutters that closed at higher speeds to seal the gaps between spokes and reduce turbulence.
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Maintenance history
When buying a car, especially a used one, it is important to know its maintenance history to ensure that it is fuel-efficient. A vehicle history report is a valuable tool for uncovering a car's past, including ownership records, accident history, and repair details. This report often includes maintenance records, which reveal if the car was regularly serviced and whether major repairs were performed.
A full car service history is a record of all the maintenance and repair work that has been done on a car over its lifetime. It includes details of all the inspections, repairs, replacements, and any other servicing that has been done to the car. This is vital for owners as it can help protect the car's value and ensure that it is running safely and efficiently. The car service record itself typically includes details such as the date and type of service, parts replaced, and any other relevant information.
Some common forms of vehicle maintenance that are typically quick and easy include changing spark plugs, wheel balance and rotation, and oil changes. Other critical services to look out for include timing belt replacement, which can be expensive, and failing to perform it can result in the belt snapping.
While a stack of service records doesn't guarantee that a vehicle is in perfect condition, it is still a good sign. Owners who regularly maintain their vehicles tend to have taken better care of them in general. If the previous owner kept all the service and maintenance receipts, it indicates that they wanted to ensure the car was in the best technical condition possible.
If you are buying a car from a dealership that has advertised a full or partial service history, you can be confident that it is legitimate. If you are unsure, get a vehicle history check or ask to see any receipts for services done since the car was originally purchased. A vehicle's official logbook should contain physical copies of all the relevant information.
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Odometer accuracy
To ensure odometer accuracy, it is recommended to use "mileage check sections" on freeways, which are stretches of road with mileage markers. By resetting the trip odometer at the beginning of this section and comparing it to the distance travelled, you can verify the accuracy of your odometer. An accurate odometer will reflect the exact distance travelled.
Additionally, you can manually calculate your car's MPG by filling up the fuel tank, recording the initial mileage (Mileage A), driving as usual until the tank is half-full, filling up again, and then recording the new mileage (Mileage B) and the number of gallons required to refill the tank. The formula for calculating MPG is (Mileage B - Mileage A) ÷ Gallons.
Modern vehicles often have digital MPG displays on the dashboard, providing real-time information about fuel efficiency. However, it is still important to understand how to manually verify odometer accuracy and calculate MPG to make informed decisions about your vehicle's performance and maintenance.
By combining odometer accuracy with MPG calculations, you can better understand your car's fuel efficiency, make comparisons with other vehicles, and identify areas for improvement, such as driving speed and acceleration patterns, to optimize fuel efficiency.
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Miles per gallon (MPG)
MPG can be used to determine whether your car is a gas guzzler that is eating up your cash. Once you know the MPG, you can calculate how much a small rise in gas prices will affect your budget or how much you could save by getting a car with better MPG.
There are several ways to calculate your car's MPG. One way is to fill up your gas tank, record the mileage (Mileage A) before driving, and then drive as you normally would until the tank is less than half full. Once the tank is low, fill it up again and record how many gallons of gas it took to fill it up. Also, write down the new mileage before you leave (Mileage B). Finally, use the formula: MPG = (Mileage B - Mileage A) / gallons.
It is important to note that not all cars reflect accurate odometer readings, which can give an inaccurate picture of your MPG. To get a more accurate reading, you can use a "mileage check section" on some freeways, or find a stretch of road with mileage markers and drive a set distance. Set your trip odometer to 0 at the start and note the reading at the end. An accurate odometer will reflect the distance you travelled.
Additionally, you can use the MPG to experiment with ways to increase fuel efficiency. For example, you can try driving at a lower average speed and measure the MPG again – it will probably be higher.
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Frequently asked questions
Fuel efficiency is a general term that refers to how well a vehicle uses fuel. A fuel-efficient car will burn less fuel to travel a certain distance and will have a higher fuel economy number. You can calculate a car's fuel efficiency by dividing the total miles run on a full tank of fuel by the capacity of the fuel tank.
The vehicle's weight is a significant factor in fuel efficiency. Lighter vehicles require less energy and fuel to move. Aerodynamics also play a role, as smaller cars are more aerodynamic, increasing their overall fuel efficiency.
To calculate your car's MPG, fill up your gas tank, record the mileage, and then drive as you normally would until your tank is less than half full. Once your tank is low, fill it up again and record how many gallons of gas it took to fill up, along with the new mileage. Finally, use the formula: Miles per gallon = (Final mileage - Initial mileage) / Gallons of gas used.
