Sylvie Willis
Driving at higher speeds uses more fuel. For example, one driver reported getting 35 miles per gallon at 60mph, but only 30 miles per gallon at 70mph. Over a 100-mile journey, driving at 70mph used £2.94 more fuel than driving at 60mph, saving only 15 minutes of time. This illustrates that driving at lower speeds can save money and is better for fuel efficiency.
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What You'll Learn
Driving at 70mph costs more in fuel and time
Driving at higher speeds uses more fuel and is costlier and riskier. While driving at 70mph may save some time, it is not worth the additional fuel costs and the increased risk of a collision.
Firstly, let's consider fuel efficiency. Driving at 60mph as opposed to 70mph over a 100-mile journey results in a notable difference in fuel costs. At 60mph, the journey will cost £17.65 at 135.9p/L and take 1 hour and 40 minutes. In comparison, driving at 70mph will cost £20.59, an additional £2.94 in fuel, and will only save 15 minutes of travel time. This means that driving at 70mph is not only more expensive but also only marginally faster.
Maintaining speed limits and driving smoothly are essential for optimizing fuel economy. By driving at lower speeds and anticipating the road ahead, you can naturally slow down and potentially avoid coming to a complete stop at traffic lights or in traffic queues. This not only saves fuel but also reduces the risk of collisions.
Additionally, driving at lower speeds has safety benefits. As Cllr Jan Matecki, Warwickshire County Council Portfolio Holder for Transport and Planning, stated, "There is no doubt that driving safely within speed limits saves fuel and lives in the event of a collision." By adhering to speed limits, you not only save money on fuel but also reduce the risk of accidents and the potential costs associated with speeding, such as fines, points on your license, or the need for a speed awareness course.
Furthermore, driving at lower speeds allows for better overall vehicle maintenance. Driving with properly inflated tyres, removing external storage when not in use, and limiting the use of air conditioning can all contribute to reduced fuel consumption. Planning your journey efficiently, combining errands, and driving with a warm engine can also help optimize fuel efficiency.
In conclusion, driving at 70mph may save a small amount of time but comes at the cost of increased fuel consumption and a higher risk of accidents. By maintaining speed limits, driving smoothly, and adopting good driving habits, you can save money, improve fuel efficiency, and enhance your safety on the road.
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Driving smoothly and sticking to speed limits saves fuel
Driving at higher speeds uses more fuel, and driving smoothly and sticking to speed limits saves fuel. For example, one driver reported that on their car, a 100-mile journey at a constant speed of 60mph would cost £17.65 at 135.9p/L and take 1 hour and 40 minutes. The same journey at 70mph would cost £20.59 and take 1 hour and 25 minutes, saving only 15 minutes of time but using almost £3 more in petrol. This demonstrates the impact of speed on fuel economy.
Driving smoothly and sticking to speed limits can, therefore, save you money on fuel. Cllr Jan Matecki, Warwickshire County Council Portfolio Holder for Transport and Planning, supports this, stating that "there is no doubt that driving safely within speed limits saves fuel and lives in the event of a collision". Matecki also highlights the other benefits of not speeding, including avoiding the risk of being caught and having to pay fines or take a speed awareness course.
Driving smoothly involves anticipating what other road users are doing and adjusting your speed naturally, rather than stamping on the brakes or accelerator. This can help you keep moving, even at slower speeds, by avoiding coming to a complete stop at traffic lights or in a queue of traffic.
In addition to driving smoothly and sticking to speed limits, there are other ways to save fuel. Removing external storage like roof racks when not in use, maintaining correct tyre pressure, limiting air conditioning, and planning your journey can all help improve fuel efficiency.
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Driving with warm engine is better for fuel efficiency
Driving style and speed can significantly impact fuel efficiency. Driving at 70mph will use more fuel than driving at 50mph. While there is no standard measure of how much fuel is used at different speeds, it is a well-known fact that the faster you drive, the more fuel you will use. Driving smoothly and sticking to speed limits can help improve fuel efficiency.
Driving with a warm engine is often considered better for fuel efficiency. In cold weather, some drivers let their car engines idle for a while to warm up before driving. While this may be tempting for comfort, it is not necessary for the engine. Modern cars are designed so that the engine is fully lubricated within 20 to 30 seconds of starting. Idling for extended periods wastes fuel and generates unnecessary emissions.
When a car sits for a long time, the oil drains to the bottom of the oil pan. Once the engine starts, the oil pump circulates the oil throughout the motor, lubricating all the necessary components. This process is quick, and the engine is ready to drive within a minute or so of starting, even if it is not yet fully warm. Driving the car is, in fact, the fastest way to warm up the engine.
However, it is important to drive gently for the first few miles when the engine is cold. Revving the engine hard or aggressive acceleration when the engine is cold can cause extra wear and tear. This is because, during the warm-up phase, the engine runs rich, and extra gas can wash away the protective layer of oil on the cylinders. So, it is recommended to stay within the blue power band and avoid high revs until the engine is warm.
Overall, driving with a warm engine can improve fuel efficiency, but it is not necessary to idle the car for extended periods. Starting the car and letting it run for a minute or so is sufficient, and then driving gently until the engine is warm will help reduce fuel consumption and engine wear.
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Tyre pressure and air conditioning affect fuel usage
Tyre pressure and air conditioning can significantly affect fuel usage. Under-inflated tyres cause increased friction and wear, making the engine work harder and reducing fuel efficiency. For every 1 psi drop in tyre pressure, fuel efficiency decreases by about 0.2%. This can add up over time, as tyres can lose 1-2 PSI per month due to temperature changes. Therefore, maintaining the correct tyre pressure is essential for improving fuel efficiency and vehicle performance.
On the other hand, over-inflated tyres can also lead to uneven tread wear and compromise handling. While the impact on fuel efficiency is negligible, over-inflation can lead to accelerated tyre wear, requiring early replacement.
Air conditioning use also affects fuel consumption. Laboratory and on-road experiments have shown that vehicles consume more fuel with the air conditioning (A/C) on at maximum cooling load, especially at higher speeds. The incremental fuel consumption rate due to A/C use tends to increase with vehicle speed. However, at idle, the fuel penalty due to A/C operation is lower, likely due to the reduced compressor speed.
Overall, maintaining proper tyre pressure and minimising air conditioning use can help improve fuel efficiency and reduce fuel costs. These factors are essential to consider when aiming to optimise fuel usage and vehicle performance.
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Driving at 60mph is more fuel-efficient than 70mph
Driving at 60mph is more fuel-efficient than driving at 70mph. This is because the power required to maintain a speed goes up with the cube of the speed. Therefore, driving at 70mph will require far more power than driving at 60mph.
RAC research found that driving at 70mph will use up to 9% more fuel than driving at 60mph. This is a significant difference, especially when considering the amount of fuel used over a long journey. For example, driving 250 miles at 70mph will use 4.7 gallons of fuel, whereas driving the same distance at 60mph will only use 3.9 gallons of fuel. That is 3.6 litres less fuel, which is a saving of around £6.40.
Driving at 60mph is also better for the environment, as it reduces emissions and improves local air quality. Additionally, driving at a slower speed can make your journey safer. It gives you more time to react to potential hazards and means that, in the event of a collision, the impact will be less severe.
However, driving at 60mph will increase your journey time. For example, a 250-mile journey at 70mph will take 3 hours and 34 minutes, whereas the same journey at 60mph will take 4 hours and 9 minutes. This is an extra 35 minutes of driving time. Therefore, you need to balance the increased fuel efficiency and safety of driving at 60mph with the extra time spent on the road.
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Frequently asked questions
Driving at higher speeds uses more fuel. However, there are no exact figures on how much fuel is used at 70mph compared to 50mph. Driving at 60mph, for example, can get you 35mpg, whereas at 70mph, you may get 30mpg.
There are many ways to save fuel. These include:
- Maintaining your vehicle by ensuring tyre pressure is correct
- Sticking to speed limits
- Limiting the use of air conditioning
- Planning your journey to avoid unnecessary mileage
- Driving smoothly by gently accelerating and braking
Yes, driving at 70mph will use more fuel than driving at 50mph. The faster you drive, the more fuel you will use.
