Katerina Swanson
Fuel efficiency is a common consideration when buying a car, and for good reason. It refers to the distance travelled per unit volume of fuel used, which can be measured in various ways, including litres per 100 kilometres (L/100 km) or miles per gallon (MPG). The most fuel-efficient cars are generally those with diesel or hybrid engines, although modern petrol engines are becoming more efficient thanks to turbochargers and hybrid technology. Electric cars are also an option, although they may not suit everyone's driving needs or budget. When it comes to specific models, the 2024 Mitsubishi Mirage is currently the most fuel-efficient and affordable gas-powered car on the market, with a starting price of less than $18,000. Other fuel-efficient options include the 2024 Honda Civic, the 2024 Hyundai Elantra, and the Toyota Corolla Hybrid.
Characteristics and Values of a Good Fuel Efficiency Car
| Characteristics | Values |
|---|---|
| Fuel consumption | The amount of fuel used per unit distance; for example, litres per 100 kilometres (L/100 km). The lower the value, the more economical a vehicle is. |
| Fuel economy | The distance travelled per unit volume of fuel used; for example, kilometres per litre (km/L) or miles per gallon (MPG). |
| Miles per gallon (MPG) | Measures how far a car can travel on a gallon of fuel (around 4.5 litres). |
| Litres per 100 kilometres (L/100 km) | Used in most European countries, Canada, China, South Africa, Australia, and New Zealand. |
| Kilometers per litre (km/L) | Used in the Americas, Asia, parts of Africa, and Oceania. |
| Fuel type | Diesel engines are generally more fuel-efficient than petrol engines due to compression ignition and higher torque. However, petrol engines with hybrid assistance and newer diesel engines can also be efficient. |
| Environmental impact | Fuel-efficient vehicles contribute to reduced foreign oil dependence and lower air pollutant emissions, helping to mitigate climate change. |
| Driving style | Driving habits and techniques, such as steady acceleration and maintaining a constant speed, can significantly impact fuel efficiency. |
| Electrical loads | Electrical components like headlights and air conditioning increase fuel consumption, especially in hybrid vehicles. |
| Tire pressure | Proper tire pressure maintenance can improve fuel efficiency, as demonstrated by a study involving Anglian Water's fleet of vehicles. |
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What You'll Learn
Fuel efficiency metrics
Fuel efficiency is a reference to the distance a vehicle can travel per unit of fuel. This is also referred to as fuel economy. There are several ways to express fuel efficiency, depending on the region.
Miles per Gallon (MPG)
Miles per gallon is a common metric in the United States, United Kingdom, and Canada. This measures how far a car can travel on a gallon of fuel (around 4.5 litres). The higher the MPG rating, the more fuel-efficient the vehicle is. For example, the 2024 Honda Civic is rated at 33/42/36 mpg city/highway/combined.
Litres per 100 Kilometres (L/100 km)
This metric is used in most European countries, Canada, China, South Africa, Australia, and New Zealand. A lower number means a vehicle is more fuel-efficient, so a car that uses 6 litres of fuel to travel 100km is more efficient than one that uses 8 litres.
Kilometres per Litre (km/L)
Kilometres per litre is another way to express fuel efficiency, and it is used in parts of the Americas, Asia, Africa, and Oceania. The higher the number of kilometres travelled, the more fuel-efficient the vehicle is.
Other Factors Affecting Fuel Efficiency
It's important to note that a vehicle's fuel efficiency can be influenced by various factors, including the type of engine, transmission, and driving conditions. For example, diesel engines are generally more fuel-efficient than petrol engines due to their compression ignition systems and higher torque, allowing them to shift through gears more quickly. Additionally, driving style can impact fuel efficiency, with aggressive acceleration and constant short trips negatively affecting fuel economy. Proper tyre pressure maintenance and turning off air conditioning when not needed can also improve fuel efficiency.
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Electric cars
Electric vehicles (EVs) are powered by rechargeable battery packs and one or more electric motors. They are highly energy efficient, converting over 77% of electrical energy from the grid to power at the wheels, compared to just 12-30% of energy conversion in conventional gasoline vehicles.
EVs offer several advantages over conventional vehicles. Firstly, they are environmentally friendly, producing zero tailpipe emissions, which helps improve air quality and reduce greenhouse gas emissions. Secondly, they provide performance benefits such as quiet and smooth operation, stronger acceleration, and reduced maintenance requirements compared to internal combustion engines. Thirdly, they offer reduced energy dependence, as electricity is a domestic energy source, reducing the need for foreign oil imports. Finally, EVs can reduce fuel costs significantly due to their high efficiency and the availability of flexible charging options.
When considering an EV, it is important to look beyond the EPA-rated range, which indicates whether the vehicle suits your driving needs and charging infrastructure in your area. You should also consider the efficiency of the EV, measured in kilowatt-hours per 100 miles, to understand how far the vehicle can travel on the electricity stored in its battery. A more efficient EV will have a smaller, lighter battery for the same distance, and faster charging times.
While charging an EV at home or at public charging stations incurs additional costs, the overall fuel economy of EVs is superior to that of conventional vehicles. For example, the 2024 Toyota Corolla Hybrid achieves an EPA-estimated combined city-and-highway fuel economy of 50 miles per gallon, compared to 35 MPG for the conventional 2024 Corolla.
In conclusion, electric cars offer superior fuel efficiency compared to their conventional counterparts, resulting in both economic and environmental benefits. With advancements in battery and efficiency technologies, EVs are becoming an increasingly attractive option for drivers seeking to reduce their fuel costs and carbon footprint.
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Diesel vs petrol
When it comes to choosing a car with good fuel efficiency, there are several options available, including hybrid, plug-in hybrid, and all-electric vehicles. The 2024 Mitsubishi Mirage, for example, is not only the least thirsty gas-powered car but is also quite affordable with a starting price of around $18,000. The Toyota Prius c Two is another fuel-efficient option that can help reduce air pollutants and foreign oil dependence.
Now, if you're trying to decide between a diesel or petrol car, there are several factors to consider. Firstly, diesel engines typically have more torque, which results in better fuel economy and acceleration. This makes diesel a preferred choice for commercial vehicles like trucks, buses, and pickups. Diesel engines also have a low peak rpm, allowing you to achieve maximum torque at a very low range. However, diesel engines tend to be louder and produce more vibrations, requiring more maintenance. They are also generally less smooth and can be more expensive to fuel.
On the other hand, petrol engines are usually smoother and quieter, making them a preferred choice for shorter distances and lower mileage. They are also better suited for sports cars and racing due to their ability to reach higher speeds. Petrol engines have more peak power, and their ignition process differs from diesel engines as they require a spark to burn the fuel.
In terms of efficiency, diesel engines have an advantage over petrol as they pack more energy into each gallon, making them more economical. This is why diesel engines are often preferred by those who drive many highway miles. However, for city driving or lower mileage, petrol may be a more convenient and cost-effective option.
Ultimately, the decision between diesel and petrol depends on your specific needs, driving habits, and preferences. Both types of engines have their strengths and weaknesses, and it's important to consider factors like fuel efficiency, performance, maintenance, and environmental impact before making a choice.
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Driving style
Anticipate and Minimize Acceleration and Braking
By anticipating the movement of other vehicles and potential changes in the road conditions, you can reduce the need for sudden braking and acceleration. This includes being mindful of the behaviour of pedestrians and animals, as well as other drivers. Smooth and gentle acceleration is more fuel-efficient than aggressive acceleration. In manual cars, it is recommended to accelerate briskly but smoothly before shifting gears.
Maintain a Steady Speed
Maintaining a constant speed, especially on highways, can improve fuel efficiency. Cruise control can be helpful in this regard, as it keeps your speed consistent and also helps you maintain a safe distance from other vehicles.
Avoid High Speeds
While each vehicle has its own optimal speed range for fuel efficiency, in general, fuel efficiency decreases rapidly above 50 mph (80 km/h). This is due to the increased wind resistance at higher speeds, which causes a significant drop in fuel economy.
Reduce Wind Resistance
Minimise the use of roof racks, brush guards, wind deflectors, and other accessories that increase wind resistance. These accessories disrupt the airflow around your car, increasing aerodynamic drag and reducing fuel efficiency.
Minimise Idling
Idling can consume a significant amount of fuel, especially with a larger engine or air conditioner use. Turn off your engine when parked or stopped for extended periods. Restarting your vehicle only takes about 10 seconds' worth of fuel, so short stops are an opportunity to save fuel without causing excessive wear on your starter.
Reduce Cargo Weight
The more weight your vehicle carries, the more fuel it will consume. Remove unnecessary cargo, tools, or equipment from your car to reduce its fuel consumption.
Choose the Right Vehicle for Your Needs
Consider the type of driving you do and select a vehicle that suits your needs. If you primarily drive in the city, a smaller, more fuel-efficient car may be ideal. For longer distances or highway driving, a vehicle with better fuel efficiency at higher speeds might be a better choice.
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Fuel-efficient models
The 2024 Mitsubishi Mirage is the most affordable fuel-efficient car on the market, with a starting price of just under $18,000. The front-wheel-drive-only Mirage hatchback and Mirage G4 sedan are both powered by a 78-horsepower, 1.2-liter three-cylinder engine. The Mirage hatchback is the most fuel-efficient of the two, rated at 36/43/39 mpg city/highway/combined. The 2024 Honda Civic also offers both sedan and hatchback body styles, with the most efficient 2024 Civic being the mid-level EX, rated at 33/42/36 mpg.
The 2024 Hyundai Elantra offers buyers a variety of engine and transmission choices. Among the non-hybrid Elantras, the base SE with a 147-hp, 2.0-liter four-cylinder engine paired with a CVT is the most fuel-efficient at 32/41/36 mpg. The 2024 Toyota Corolla Hybrid is another practical choice, with a 1.8-liter four-cylinder engine coupled with two electric motors and a CVT for a total of 138 hp. The Corolla Hybrid is available with either FWD or AWD, with the former providing better mileage, with up to an EPA-estimated 53/46/50 mpg.
The Toyota Prius is a well-known hybrid with excellent fuel efficiency. The base 194-hp LE trim with FWD is the most efficient at 57/56/57 mpg. The 2024 Kia Niro is also available with a hybrid, plug-in hybrid, or all-electric powertrain. The Niro hybrid’s base FE trim makes 139-hp from a 1.6-liter four-cylinder paired with two electric motors; it gets 53/54/53 mpg. The 2024 Volvo S60 Recharge is another option, featuring a turbocharged 2.0-liter four-cylinder engine, an electric motor, and a 14.9-kWh battery with a combined 455 horsepower. It earns fuel economy ratings of 74 MPGe and 31 mpg combined.
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Frequently asked questions
Some of the most fuel-efficient cars include the 2024 Mitsubishi Mirage, the 2024 Honda Civic, the 2024 Hyundai Elantra, the Toyota Corolla Hybrid, the Toyota Prius Prime, the Kia Niro Plug-In Hybrid, the Ford Escape Plug-In Hybrid, and the Toyota RAV4 Prime.
There are several ways to improve your car's fuel efficiency, such as turning off your air conditioning, maintaining steady revs and speed, and avoiding short trips. Additionally, choosing a fuel-efficient vehicle, such as a diesel engine or a hybrid car, can significantly impact your fuel consumption and costs.
Fuel efficiency is typically measured in miles per gallon (MPG) or litres per 100 kilometres (L/100 km). MPG measures how far a car can travel on one gallon of fuel, while L/100 km indicates the number of litres of fuel required to travel 100 kilometres. A lower value in L/100 km or a higher value in MPG indicates better fuel efficiency.
