Ameer Randolph
It is a common misconception that newer cars are more fuel-efficient. While car engines have become more adept at saving fuel over the years, most cars today still don't perform much better than their counterparts from the early 80s. In fact, size and weight are more important factors when it comes to fuel consumption. Cars are getting bigger and heavier, which leads to increased fuel consumption. Additionally, new cars may use more fuel during their first 500-1000 miles as the engine parts, transmission, and drive train are all new and tight, requiring more fuel. Other factors that influence fuel efficiency include proper maintenance, tyre pressure, engine lubrication, and driving habits such as acceleration and speed.
| Characteristics | Values |
|---|---|
| Fuel consumption | Fuel efficiency has improved over time, with the latest models averaging around 60 mpg. However, size and weight also play a role, with larger and heavier cars requiring more fuel. |
| New cars | New cars may consume more fuel during the initial 500-1000 miles as the engine, transmission, and drive train "break in." |
| Manufacturer data | Manufacturer-provided fuel consumption data may not always reflect real-world driving conditions. |
| Driving style | Driving style can significantly impact fuel consumption. Aggressive acceleration, high speeds, and frequent braking can increase fuel usage. |
| Maintenance | Proper maintenance, including regular servicing, clean oil, correct tyre pressure, and new filters, can improve fuel efficiency. |
| Cruise control | Using cruise control to maintain a steady speed can reduce fuel consumption by minimizing harsh acceleration and reducing engine pressure. |
| Air conditioning | Using air conditioning sparingly and opening windows instead can help save fuel. |
| Navigation | Planning routes and using navigation systems can help avoid unnecessary fuel consumption due to getting lost or driving in congested areas. |
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What You'll Learn
New car engines use more fuel during the first 500-1000 miles
While new cars are better engineered and put together, with modern engine oils, a little extra care in a new car's early days can improve reliability, oil consumption, and fuel consumption. Generally, for the first 500 to 1000 miles of a new car's life, the engine will use more fuel than usual. This is because the engine, transmission, and drive train are all new and tight and will, therefore, use slightly more fuel. Manufacturers advise not to exceed certain revs until the engine has settled in.
The running-in or breaking-in period is when the engine, transmission, and drive train are new and tight, and the engine parts are settling into place. During this period, it is important to follow the manufacturer's guidelines on how to run in the engine properly. This may include advice on keeping engine revs below a certain limit, such as 3000 rpm, and not hammering the engine for a certain mileage. For example, some manufacturers suggest not exceeding 70 mph for the first few hundred miles.
To improve fuel efficiency during the breaking-in period, it is recommended to drive gently, avoiding harsh acceleration and heavy braking. It is also important to regularly check oil and coolant levels, as a new car's oil consumption may be unpredictable. Additionally, keeping the tyres properly inflated can help improve fuel efficiency, as underinflated tyres can increase fuel consumption due to increased drag on the wheel.
After the first 500 to 1000 miles, the engine will be more settled, and fuel consumption should improve. However, it is still important to maintain the vehicle properly and follow fuel-saving tips to optimize fuel efficiency. This includes regular servicing, such as oil changes and new filters, as well as proper tyre maintenance and planning routes to avoid unnecessary fuel usage.
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Cars are getting bigger and heavier, impacting fuel efficiency
Cars are getting bigger and heavier, which impacts fuel efficiency. This is due to several factors, including the increasing popularity of SUVs and the trend towards larger vehicles in general. The average weight of an American car today is around 4300 pounds (approximately 1950 kilograms), making it the heaviest it has ever been. This weight gain can be attributed to various factors, such as the inclusion of additional safety features and the use of heavier materials.
While fuel economy in the US has improved since 1975, with the number of miles per gallon nearly doubling, the total amount of CO2 emitted has not decreased. This is because the increased miles driven have outpaced the improvements in fuel efficiency. Additionally, the gains in fuel economy are not unique to the US, and similar trends are observed worldwide.
The relationship between car size and fuel efficiency is complex. While larger, heavier vehicles may have improved fuel efficiency due to technological advancements, they still generally consume more fuel than smaller, lighter vehicles. This is because larger cars have bigger engines with more moving parts, resulting in greater energy loss due to friction. Additionally, heavier vehicles require more energy to accelerate and maintain speed, further contributing to higher fuel consumption.
However, it is important to note that size is not the only factor affecting fuel efficiency. Other factors, such as air drag and driving style, also play a significant role. For example, SUVs and pickups have been modified in recent years to reduce their threat to smaller vehicles by lowering their energy-absorbing structures. This modification can improve fuel efficiency while maintaining safety.
Furthermore, the development of more fuel-efficient hybrids and electric vehicles (EVs) has reduced the impact of size on fuel economy. As technology advances, it becomes possible to have bigger cars with minimal impact on fuel consumption. Nevertheless, the trend towards larger, heavier vehicles in the US and worldwide continues to pose challenges in terms of fuel efficiency and environmental impact.
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Diesel cars are more fuel-efficient than petrol cars
While new cars may consume more fuel initially as the engine settles in, diesel engines are more fuel-efficient than petrol engines. Diesel engines offer improved efficiency over gas engines without using electricity. They have nearly half the market share in Europe and are particularly favoured by customers who drive many highway miles.
Diesel fuel packs more energy in every gallon than gas fuel, making it more economical overall. It is denser than petrol and contains about 15% more energy by volume. This means that, in terms of fuel economy, you get more "bang for your buck".
Diesel engines are also more efficient at converting fuel to mechanical energy. They have a higher compression ratio, which leads to a higher expansion ratio and, thus, higher efficiency. Unlike petrol engines, diesel engines are unthrottled and can draw in as much air as they want, controlling the power by injecting more or less fuel. This results in better fuel economy and more impressive acceleration.
However, it is important to note that some types of diesel fuel can negatively impact vehicle performance, and diesel engines have received negative attention from politicians and climate protesters due to air quality and public health concerns.
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Manufacturer consumption data should be taken with a grain of salt
It's important to take manufacturer consumption data with a grain of salt. While manufacturers provide fuel consumption figures, these are often hard to achieve in practice. For example, a car that is said to average 40 mpg may only get 30-40 mpg in reality due to varying conditions and driving styles. This is supported by the fact that most data provided by manufacturers is theoretical and may not apply to real-life driving situations.
Additionally, size and weight are more important factors in fuel consumption than age and technology. Cars are generally getting bigger and heavier, which can impact fuel efficiency. For instance, the Mini has evolved from a small, compact car to a spacious automobile, and today's models may not be much more fuel-efficient than their counterparts from the early 80s.
Furthermore, when considering a new car purchase, it's important to keep in mind that new cars are ecologically problematic as they take a lot of energy to build. Unless your current car is extremely inefficient, you may not see significant financial rewards from switching to a newer model with better fuel efficiency.
Finally, it's worth noting that new engines may use more fuel during the initial "run-in" period, typically the first 500-1000 miles, as they are tighter and need to "settle" in. During this time, manufacturers may recommend not exceeding certain revs or driving styles to protect the engine.
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Underinflated tyres can increase fuel consumption
While new cars are generally more fuel-efficient than older models, several factors can affect their fuel consumption. One significant factor is tyre pressure. Underinflated tyres can increase fuel consumption and lead to several other issues that compromise safety and performance.
Underinflated tyres increase rolling resistance, which makes the engine work harder, resulting in higher fuel consumption. A study by the National Highway Traffic Safety Administration (NHTSA) in the USA found a direct correlation between tyre pressure and fuel economy. For every 1% decrease in tyre pressure, there is a corresponding 0.3% reduction in fuel economy. This means that underinflating a tyre by 10% increases fuel consumption by 2%, and underinflation by 40% increases fuel consumption by a significant 8%. Tyre pressure can also be affected by temperature changes, with a 2% loss in tyre pressure for every 5 °C drop in temperature.
Underinflated tyres are also a leading cause of tyre failure. The low pressure causes the tyre to spread out, increasing the surface area in contact with the road. This increased contact area results in higher friction, compromising vehicle performance and causing uneven tread wear. The higher friction also generates more heat, which can lead to tyre failure.
To ensure optimal fuel economy and tyre longevity, it is essential to maintain correct tyre pressure. Refer to your vehicle's owner's manual for the recommended tyre pressure and check your tyres regularly using a tyre gauge. By maintaining proper tyre pressure, you can improve vehicle safety, performance, and fuel efficiency while extending the life of your tyres.
In conclusion, while new cars are generally designed to be more fuel-efficient, underinflated tyres can significantly impact their fuel consumption. Regular tyre pressure checks and maintenance are crucial to optimizing fuel economy and maintaining the overall performance and safety of your vehicle.
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Frequently asked questions
New cars generally consume more fuel during their first 500-1000 miles. This is because the engine, transmission, and drive train are breaking in, and new engines tend to be tighter and use slightly more fuel.
To improve the fuel efficiency of your new car, you can follow the below steps:
- Follow the manufacturer's "running-in" advice in the handbook or consult the dealer for guidance.
- Start with gentle driving to allow the brakes and other components to bed in.
- Avoid harsh acceleration and heavy braking.
- Regularly check oil and coolant levels.
- Maintain correct tyre pressure and keep the engine properly lubricated.
- Use cruise control to maintain a steady speed and reduce pressure on the engine.
- Plan your route efficiently and use a sat nav to avoid getting lost and wasting fuel.
Fuel efficiency has improved over time, but the gains may not be significant enough to justify switching to a newer model solely for fuel economy. Size and weight are more critical factors in fuel consumption than age and technology. Cars tend to be bigger and heavier nowadays, which can offset the advantages of technological advancements.
Apart from the car's age, size, and weight, several other factors influence fuel consumption:
- Driving style: Aggressive acceleration, high speeds, and frequent braking can increase fuel usage.
- Maintenance: Proper maintenance, including regular servicing, clean oil, correct tyre pressure, and new filters, can improve fuel efficiency.
- Route conditions: Traffic congestion, steep hills, and poor road surfaces can contribute to higher fuel consumption.
- Air conditioning: Using air conditioning sparingly and opening windows instead can help save fuel.
