Sylvie Willis
Fuel consumption is a major expense for car owners, with the average person in the UK spending £1,042 a year on petrol. While fuel efficiency has improved since the mid-70s, when it was at 12 mpg, it has stagnated in recent years. For instance, any car produced later than 1990 and before 2007 will have a similar consumption rate. This has led to questions about whether brand new cars use more fuel at first. According to some sources, new cars may use more fuel during the first 500-1000 miles while the engine settles in and learns the driver's habits.
| Characteristics | Values |
|---|---|
| Do brand new cars use more fuel initially? | Yes, new cars use more fuel in the beginning while the engine 'settles' in. |
| How much more fuel do new cars use? | For the first 500-1000 miles, new engines are tight and will use a bit more fuel. |
| How does this affect the manufacturer's MPG claims? | It is hard to achieve the manufacturer's MPG claims unless you drive in a certain way. Generally, you may achieve near their claims, so if they say 40 mpg, expect anything from 30-40 mpg. |
| How does driving style impact fuel consumption? | Driving in stop-and-go traffic or city driving conditions will impact fuel efficiency. |
| How has fuel efficiency changed over time? | Fuel efficiency has improved since the mid-to-late 70s, when it was around 12 mpg, to now, where some cars can achieve 60 mpg. |
| How does fuel consumption compare between new and used cars? | Newer cars can be more fuel-efficient than older models, but the difference in fuel costs may not be significant. |
| What are the average fuel costs in the UK? | On average, drivers in the UK spend £1,042 per year on petrol. |
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What You'll Learn
New car engines use more fuel for the first 500-1000 miles
When you buy a new car, it is important to remember that the fuel consumption during the first 500-1000 miles might be higher than the manufacturer's MPG rating. This is because new engines are typically tighter and will use a bit more fuel until they have settled in or bedded in. During this period, manufacturers recommend not exceeding certain revs and not hammering the engine.
For example, a 2016 Mazda 3s GT, the "sportier" model of the compact economy Mazda car, gets 36 mpg on the highway. However, when the car was new, it may have consumed more fuel during the first 500-1000 miles. This is a common occurrence with new cars and is not specific to any particular make or model.
The higher fuel consumption during the initial period is due to the engine settling in or bedding in. This is when the ECU (Engine Control Unit) learns the car and how it uses fuel. The ECU controls various aspects of the engine, such as fuel injection and ignition timing, to optimize performance and fuel efficiency. During the first few miles, the ECU collects data on the car's performance and adjusts its settings to find the most efficient balance.
After the initial 500-1000 miles, you can expect the fuel consumption to stabilize and get closer to the manufacturer's MPG rating. However, it is important to note that achieving the exact MPG stated by the manufacturer may still be challenging, as it depends on various factors such as driving conditions and individual driving habits.
To summarize, new car engines may use slightly more fuel during the first 500-1000 miles due to the engine settling in and the ECU learning the vehicle's performance characteristics. After this initial period, fuel consumption should stabilize, and you can expect to achieve more realistic MPG figures.
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Driving style impacts fuel consumption
Driving style has a significant impact on fuel consumption, and this is true for both new and old cars. Aggressive driving behaviours such as rapid acceleration, speeding, and hard braking can increase fuel consumption by up to 40%. This is because such driving behaviours require the engine to work harder, burning more fuel in the process. Additionally, aggressive driving can also lead to increased wear and tear on the engine and other mechanical components, which can further impact fuel efficiency.
On the other hand, adopting a more conservative driving style can help improve fuel efficiency. This includes driving within the speed limit, accelerating gradually, and maintaining a constant speed as much as possible. Driving at slower speeds can also help, as fuel efficiency tends to decrease at higher speeds due to increased aerodynamic drag. For example, driving at 70 mph instead of 60 mph can increase fuel consumption by up to 25%.
The type of driving conditions can also affect fuel consumption. For instance, driving in stop-and-go traffic or in hilly terrain can result in lower fuel efficiency compared to driving on open highways or flat roads. This is because the engine has to work harder to accelerate and climb slopes, respectively. Additionally, driving in extreme weather conditions, such as strong headwinds or icy roads, can also impact fuel efficiency.
Furthermore, the weight of the vehicle and the load it carries can also influence fuel consumption. A heavier car requires more fuel to move compared to a lighter one. Similarly, carrying additional weight, such as a roof rack or a loaded boot, can also decrease fuel efficiency. This is because the engine has to exert more effort to propel the additional mass.
Finally, it is worth noting that modern engines are designed to be more fuel-efficient than their older counterparts. However, this does not mean that fuel efficiency has improved year after year. There have been periods of stagnation, such as between the 1990s and 2007, where fuel efficiency remained relatively unchanged. Nonetheless, gradual improvements in engine technology and emissions standards have led to more fuel-efficient vehicles over time.
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Cars are becoming heavier, impacting fuel efficiency
While cars are indeed becoming more fuel-efficient, motorists are responding by buying more fuel-hungry cars. As a result, the average efficiency of cars has not changed significantly since figures were first collected in 1963. This phenomenon has been likened to walking down an 'up' escalator. Even if vehicles become more fuel-efficient overall, motorists will likely drive further and more often, thus cancelling out any efficiency gains.
In the US, the average fuel economy of new passenger cars increased by less than 6.5% from 1980 to 2004, while the average curb weight of these cars increased by 12%. During the same period, the average horsepower of new passenger cars increased by 80%. Changes in light-duty trucks have been even more pronounced, with average horsepower and weight increasing by 99% and 26%, respectively. As cars became more efficient, people began buying larger, heavier, and more powerful cars, particularly sport utility vehicles and crossovers.
The weight of a car is a significant factor in fuel efficiency. Lighter cars are more fuel-efficient because the engine has less total weight to move. Newer vehicles are made with lighter materials such as aluminium, fibreglass, and ceramic, which help reduce weight and improve fuel efficiency. Additionally, during the initial break-in period of a new car, the ECU learns the car and how it uses fuel, which may result in higher fuel usage during the first few miles.
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Fuel injection has improved fuel efficiency
The introduction of fuel injection systems has been a significant factor in enhancing engine power and fuel efficiency in modern automobiles. Fuel injection systems have replaced carburetor systems, which were used to control fuel intake by regulating the volume of gasoline and air admitted into the piston. The carburetor's mechanical delivery mechanism produced an inconsistent mist, leading to inefficient combustion.
Fuel injection, on the other hand, utilizes computer-controlled technology to precisely manage the timing and amount of fuel released, depending on the engine's demands. This innovation allows for a much finer and more controlled mist, improving combustion efficiency and increasing available power. The ability to inject fuel at various angles and control multiple injectors in each piston enhances the overall efficiency of the engine.
The use of digital logic and micro-controllers has revolutionized fuel injection implementation. For example, Honda's VTEC line has incorporated this technology, showcasing its effectiveness in improving engine performance. The introduction of fuel injection has also played a crucial role in meeting stringent emissions and fuel efficiency standards mandated by governments worldwide.
Additionally, fuel injection strategies have been pivotal in reducing emissions from engines. By optimizing injection characteristics such as injection pressure, rate shapes, timing, and multiple injections, engine manufacturers can strike a balance between performance and emissions. For instance, increasing fuel injection pressure can improve fuel atomization, leading to better combustion and reduced emissions of hydrocarbons, carbon monoxide, and particulate matter.
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Petrol costs are just one expense of many when it comes to cars
When buying a new car, it's important to consider the various costs involved in ownership, and petrol or fuel costs are a significant factor. While it may seem logical that newer cars are more fuel-efficient, this is not always the case. In fact, some newer cars may even use more fuel initially while the engine 'settles' in or ''runs in'. This period can last for the first 500-1000 miles of driving, during which the ECU (Engine Control Unit) learns the car's fuel usage patterns.
That being said, fuel consumption has improved over time. The early models of the Golf Diesel, introduced in 1977, achieved an average fuel consumption of 36 mpg. Today's best models can average around 60 mpg. However, despite these advancements, the overall improvement in fuel efficiency has been slow. Cars from the early 80s may not perform much better than today's cars in terms of fuel efficiency. Additionally, cars are getting bigger and heavier, which can offset the gains made in fuel efficiency.
The cost of petrol or fuel is just one of the many expenses associated with car ownership. On average, petrol costs can amount to £1,042 per year in the UK. However, this is just a fraction of the total costs, which can include insurance, maintenance, repairs, and more. For example, car insurance can cost an average of £417 per year. These additional costs can quickly add up, and it's important for car owners to consider all these factors when budgeting for a vehicle.
While it's important to consider fuel efficiency when purchasing a car, other factors can influence the overall cost of ownership. The initial purchase price of the car, financing charges or loan payments, registration fees, and taxes can all impact the overall expense. Additionally, maintenance and repair costs can vary depending on the make and model of the car, as well as its age and condition. Regular maintenance, such as oil changes, tyre replacements, and brake repairs, can add up over time.
In conclusion, while petrol costs are a significant expense for car owners, they are just one of many financial considerations. By researching and comparing various models, considering fuel efficiency, and budgeting for additional costs, individuals can make more informed decisions about car ownership and minimise their overall expenses.
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Frequently asked questions
Yes, new cars tend to use more fuel in the beginning while the engine 'settles' in. This is because new engines are tighter and will use more fuel for the first 500-1000 miles.
On average, car owners in the UK spend £1,042 a year on petrol. By switching to a newer car, you can expect to save about 20% on fuel costs, which amounts to roughly £200 per year or £15 per month.
Yes, newer cars generally have better fuel efficiency than older cars. For example, the first Golf Diesel introduced in 1977 had an average fuel consumption of 36 mpg, while today's best models average around 60 mpg.
