Mercedes Mullins
With rising fuel prices, it's important to consider a car's fuel efficiency. Fuel efficiency is a measure of how much distance a car can travel with a specific volume of fuel. It is described as miles per gallon (mpg) in America. Fuel-efficient vehicles combine several features, including aerodynamic design, to reduce drag and improve how air flows around the car. The Environmental Protection Agency (EPA) rates the fuel economy of new vehicles, and their ratings are worth considering when shopping for a new car. Hybrid, plug-in hybrid, and all-electric vehicles are some of the most fuel-efficient options available today, with some getting over 30 miles to the gallon of gas.
Characteristics of a Fuel-Efficient Car
| Characteristics | Values |
|---|---|
| Engine efficiency | Modest power with four-cylinder engines |
| Aerodynamics | Effortlessly slices through wind with blunt designs causing drag |
| Speed | Driving at consistent, even speeds without quick launches |
| Weight | Lighter vehicles are more fuel-efficient |
| Fuel type | Electric vehicles are the most fuel-efficient |
| Mileage | Getting great gas mileage/ MPG efficiency |
| Cost | Most fuel-efficient vehicles are under $30,000 |
| Emission | Low emissions |
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What You'll Learn
Fuel efficiency ratings
The EPA's ratings are especially useful if your motivation is to save money or protect the environment. You can save on gasoline and money when you buy a fuel-efficient vehicle. The most fuel-efficient vehicles today are also under $30,000 and get over 30 miles to the gallon of gas.
According to the California Air Resources Board (CARB), fuel-efficient vehicles are defined as vehicles that have achieved a minimum green score of 40 on the American Council of Energy Efficiency Economy (ACEEE) rating guide.
The speed at which you drive also affects fuel efficiency. Driving at consistent, even speeds without accelerating quickly will help you get the best fuel efficiency numbers.
Some of the most fuel-efficient vehicles on the market today include the 2024 Mitsubishi Mirage, the 2024 Honda Civic, the 2024 Hyundai Elantra, the 2023 Toyota Prius, and the Honda Accord Hybrid.
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Hybrid and electric vehicles
Hybrid vehicles offer a smooth transition from traditional gasoline-powered cars, as they still utilise gasoline engines but with improved fuel efficiency. They are also more practical for those with limited access to charging stations, such as those living in apartments. Additionally, hybrids can have smaller engines due to the extra power provided by the electric motor, further contributing to their fuel efficiency.
Electric vehicles (EVs), on the other hand, completely eliminate the need for gasoline, resulting in zero emissions and cutting fuel costs to zero. While the switch to electric may not suit everyone's driving needs or budget, they represent a significant step towards reducing environmental impact.
The design of both hybrid and electric vehicles also plays a crucial role in their fuel efficiency. Aerodynamic shapes, such as the bullet-like form of many hybrids and EVs, reduce drag and allow the vehicle to move through the air more efficiently, further improving fuel economy.
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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 consumed at a specific speed. Aerodynamic drag comes from a variety of sources, including skin friction, turbulence, and pressure differences. Carmakers are keen to improve aerodynamic efficiency to achieve better fuel mileage and sell more cars.
The basic shape of a car is the most important factor in its aerodynamic performance. Designers and engineers have focused on visible surfaces to create streamlined vehicles. However, some shapes are inherently more aerodynamic than others. Aerodynamicists and designers subtly shape every vehicle to reduce drag. For example, rounded edges at the front of a vehicle reduce turbulence and drag.
Cooling requirements, such as airflow into the vehicle through the radiator, can increase drag. Automakers must balance cooling needs with aerodynamic efficiency. The underbody of a car can significantly impact its aerodynamic performance. Flat underbodies and panels can smooth airflow and reduce turbulence, improving aerodynamics and fuel efficiency.
Spoilers and diffusers manage airflow and reduce lift. They are common in sports cars but are increasingly found in regular passenger vehicles to enhance stability and efficiency. Grills and vents manage airflow to cool the engine and brakes but can also increase drag.
Automakers are spending more on aerodynamic improvements that may not be visible to customers. These include panels that fill gaps on the vehicle's underside. The inclusion of specific features like spoilers, underbody panels, and dive planes can improve a car's aerodynamic properties.
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Driving style
Maintain Steady Speed
Small variations in speed can increase fuel consumption by 20-48%. Using cruise control on highways can help maintain a steady speed, but it is best to turn it off in hilly terrain. In such cases, allow your car to slow down naturally when travelling uphill and speed up when going downhill.
Avoid High Speeds
Gas mileage decreases rapidly at speeds above 50 mph. Driving at 55 mph instead of 65 mph can improve gas mileage by 10-15%. The recommended speed for optimal fuel efficiency is between 35 and 50 mph.
Smooth Acceleration and Deceleration
Aggressive driving habits, such as rapid acceleration and abrupt braking, lead to increased wear and tear on your vehicle. Smooth acceleration and deceleration can significantly reduce fuel consumption. A study from 2001 recommended accelerating briskly, but smoothly before shifting in manual cars.
Minimise Acceleration and Braking
Fuel efficiency is maximised when acceleration and braking are minimised. Anticipate the road ahead and drive in a way that minimises acceleration and braking while maximising coasting time.
Properly Inflated Tires
Under-inflated tires can increase fuel consumption by up to 6%. Keep your tires properly inflated by checking the pressure at least once a month and inflating them to the recommended level.
Reduce Cargo and Accessories
Hauling cargo on your roof increases aerodynamic drag and lowers fuel economy. Remove unnecessary accessories such as roof racks, brush guards, and wind deflectors to improve fuel efficiency by reducing weight and drag. Minimising the transported mass inside your vehicle can also help improve fuel efficiency.
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Fuel costs
The Environmental Protection Agency (EPA) in the US rates the fuel economy of vehicles, and their ratings are worth considering when shopping for a new car. The EPA puts each vehicle through a series of tests to determine its fuel efficiency in different settings, and this combined mileage is an average amount for most drivers. The EPA's ratings can help you make an educated decision about which car to buy, and they are a good indicator of how much a vehicle will cost you in fuel.
In Australia, the Motor Vehicle Standards Act 1989 requires manufacturers and importers to comply with the Australian Design Rules (ADRs) regarding fuel consumption labelling. This means that all new vehicles must have a label indicating their fuel consumption, enabling customers to compare vehicles and make an informed choice about fuel efficiency and greenhouse impact. The ATO defines fuel-efficient vehicles as those that do not exceed seven litres of fuel per 100 kilometres. This definition is important for tax purposes, as the luxury car tax threshold is higher for fuel-efficient vehicles, offering tax savings of up to $4,064.
Fuel efficiency is determined by several factors, including aerodynamics, speed, engine type, size, weight, axle ratio, and emissions. Aerodynamic designs can help vehicles slice through the wind more efficiently, reducing drag and improving fuel efficiency. Maintaining a consistent speed without rapid acceleration can also help improve fuel efficiency, as aggressive driving can use up more fuel.
Overall, choosing a fuel-efficient vehicle is a great way to save money on fuel costs, and there are many affordable options available that offer excellent fuel economy.
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Frequently asked questions
A fuel-efficient car is one that gets great gas mileage. The Environmental Protection Agency (EPA) in the US rates the fuel economy of vehicles so consumers can make an educated decision. The EPA puts each vehicle through a variety of tests to determine how many miles per gallon it gets on the highway, in city driving, and combined driving. The combined mileage is the average amount of miles per gallon for most drivers.
There are several factors that contribute to a vehicle's fuel efficiency, including aerodynamics, speed, engine type, size, weight, axle ratio, and low emissions. Automakers spend a lot of time and money creating car body designs that are aerodynamic, allowing the car to slice through the wind effortlessly with minimal fuel usage.
Some of the most fuel-efficient cars include the 2024 Mitsubishi Mirage, the 2024 Honda Civic, the 2024 Hyundai Elantra, the Toyota Prius, the Honda Accord Hybrid, the Honda Civic Hybrid, the Kia Niro, the Hyundai Elantra Hybrid, and the Toyota Corolla Hybrid.
Yes, there can be tax benefits to owning a fuel-efficient car. For example, in Australia, the luxury car tax threshold for fuel-efficient vehicles is higher than for non-fuel-efficient vehicles, resulting in tax savings for owners of fuel-efficient cars.
