Mercedes Mullins
The type of tyres on a car can make a notable difference to fuel economy. Fuel-efficient tyres can help reduce fuel consumption by decreasing rolling resistance. Narrow tyres are generally more fuel-efficient than wider tyres because they have lower amounts of friction. The depth of the tread also plays a role, with shallower treads being more fuel-efficient. Additionally, ensuring tyres are inflated to the correct pressure can improve fuel efficiency by reducing rolling resistance. The savings from improved fuel efficiency can offset the higher cost of premium tyres. However, some drivers prioritise wet grip ratings over fuel efficiency for safety reasons.
| Characteristics | Values |
|---|---|
| Tyre pressure | Correct tyre pressure improves fuel efficiency |
| Tyre size | Smaller tyres improve fuel efficiency |
| Tyre tread | Shallower tread improves fuel efficiency |
| Tyre type | Fuel-efficient tyres improve fuel economy |
| Tyre cost | Fuel savings can offset the cost of more expensive, fuel-efficient tyres |
| Tyre brand | Reputable brands offer similar fuel efficiency |
| Tyre alignment | Misaligned wheels decrease fuel economy |
| Tyre width | Narrow tyres are more fuel-efficient |
| Tyre grip | Good grip improves fuel economy |
| Tyre rolling resistance | Reduced rolling resistance improves fuel efficiency |
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What You'll Learn
Tyre pressure and fuel efficiency
Tyre pressure has a significant impact on fuel efficiency. Under-inflated tyres increase a vehicle's drag, leading to increased fuel consumption. Conversely, over-inflated tyres provide a bumpier ride, compromise handling, and cause uneven tread wear.
A study by the National Highway Traffic Safety Administration (NHTSA) in the USA found a strong correlation between tyre pressure and fuel economy. For every 1% decrease in tyre pressure, there was a corresponding 0.3% reduction in fuel economy. This means that under-inflating a tyre by 10% increases fuel consumption by 2%, by 20% increases consumption by 4%40% under-inflation, consumption increases by 8%. Considering that tyres can naturally lose one to two PSI per month, maintaining optimal tyre pressure can help save money at the pump.
Temperature changes can also affect tyre pressure. For every 5 °C drop in temperature, there is a 2% loss in tyre pressure, while a 5 °C rise leads to a 2% increase. These fluctuations can significantly impact fuel efficiency, especially when combined with the typical monthly pressure loss.
While some sources suggest that the impact of tyre pressure on fuel efficiency is negligible, others emphasize that the savings can be greater if your car is less efficient, as you would otherwise spend more on fuel. Additionally, it is worth noting that replacing your back wheels with more fuel-efficient tyres is more cost-effective than doing the same with front wheels, as they last longer while providing the same drag reduction.
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Tyre size and fuel consumption
Tyre size plays a significant role in a vehicle's fuel economy. The size of your tyres affects the engine's torque curve relative to the vehicle's weight. The right tyre size should align the engine's peak torque RPM (revolutions per minute) with the vehicle's weight, optimising fuel efficiency.
Generally, larger tyres reduce fuel efficiency due to their weight and greater rolling resistance. Rolling resistance is crucial for providing grip and traction for safety. However, higher rolling resistance means more energy is needed to overcome it, increasing fuel consumption. Wider tyres have a larger contact patch with the ground, resulting in more surface area in contact with the ground. Consequently, more energy is required to propel the vehicle forward, leading to reduced fuel efficiency. Additionally, larger and heavier tyres contribute to the overall weight of the vehicle, necessitating extra power during acceleration and causing the engine to work harder, thereby reducing engine efficiency.
On the other hand, narrower tyres have a smaller contact patch, resulting in less friction and lower rolling resistance. Their slimmer shape and reduced weight help lower wind resistance while driving, improving fuel efficiency. However, narrow tyres may pose handling challenges in certain situations. Maintaining proper tyre pressure is crucial for optimising fuel efficiency and mitigating handling issues associated with narrower tyres.
It is worth noting that while tyre size significantly impacts fuel consumption, other factors, such as tyre pressure, tread wear, and driving conditions, also play a role in a tyre's fuel efficiency. For example, underinflated tyres create greater resistance, requiring more effort from the engine to start moving. Additionally, tyres with deeper treads provide more resistance, making it harder for the vehicle to reach faster speeds and potentially impacting fuel efficiency.
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Tyre tread and rolling resistance
Tyre rolling resistance is the force resisting the motion of a tyre rolling on a surface. It is caused by non-elastic effects, such as the energy lost when a tyre rolls through its footprint, known as hysteresis. Rolling resistance also generates sound energy as mechanical energy is converted to sound through the friction of tyre treads on the road.
The thicker and more contoured the tread, the higher the rolling resistance. This is why heavy-duty trucks get better fuel economy as their tyre tread wears out. However, a reduction in tread depth can decrease tyre life. Tyre manufacturers can formulate tread compounds that are more resistant to heat generation and minimise tyre deflection to reduce energy loss, creating low rolling resistance tyres.
Low rolling resistance tyres are designed to optimise vehicle fuel efficiency. The U.S. Department of Energy has found that low rolling resistance tyres can save drivers up to 10% on fuel, although most drivers save around 3%. While this may not seem like a significant amount, it can add up over time, resulting in substantial fuel cost savings.
Radial ply tyres, commonly used on battery vehicles, offer a more supple casing, reducing energy loss due to flexing of the walls. This can result in a 13% reduction in energy consumption or a 15% increase in range. Additionally, radial ply tyres are less sensitive to variations in inflation pressure.
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Tyre grip and safety
Tyre grip is a critical aspect of vehicle safety and performance. It is the friction between the tyres and the road surface, which allows the vehicle to accelerate, brake, and corner safely. The effectiveness of a vehicle's acceleration and braking depends on how well the tyres adhere to the road surface. Adequate traction during acceleration allows for a seamless transfer of power, ensuring the vehicle moves forward without wheel spin. This traction is also critical for braking, as tyres that grip the road effectively shorten stopping distances, thereby enhancing control and safety. In cornering situations, tyre grip is vital for maintaining vehicle stability and precise steering.
The three main factors that impact tyre grip are the tyre tread pattern, the type of compound used, and the tread depth of the tyre. The tread pattern refers to the design of the tread on a tyre, which incorporates ribs, blocks, grooves, and sipes. The rib and groove pattern on each individual tyre is carefully engineered to give optimum grip, handling, and durability. The specific formulation of the rubber compound used on a tyre directly impacts the grip. Tyres with a softer compound can increase the contact area and, therefore, the grip. Harder compounds tend to offer less grip but are more durable.
Tread depth is essential for how well a tyre can navigate various road surfaces. It allows the tyre to effectively clear water, snow, and debris, ensuring continuous road contact. As tyres wear down, their effectiveness in maintaining traction decreases, increasing the risk of losing control, especially on wet surfaces. The minimum legal requirement for tread depth is 1.6mm, but the recommended tread depth for optimum grip is 3mm or above.
Tyre pressure is another important factor in tyre grip and safety. Correct inflation ensures the tyre's surface contacts the road evenly, optimising grip and vehicle handling. Underinflated tyres can lead to increased friction, reduced traction, and uneven wear patterns, affecting safety and performance. Overinflated tyres decrease the area of contact with the road, reducing traction and comfort.
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Tyre cost and value
While the initial cost of fuel-efficient tyres may be higher, they can provide significant long-term value. Fuel-efficient tyres can reduce rolling resistance, leading to lower fuel consumption and savings on fuel costs. The savings can offset the higher upfront cost of the tyres. For example, with fuel-efficient tyres, you may save £19 per year on fuel for a full set, which equates to £80 over the tyres' lifespan.
Additionally, it's important to consider the condition and maintenance of your tyres. Regularly checking your tyre pressure and ensuring they are inflated to the correct level can improve fuel efficiency. Underinflated or overinflated tyres can increase rolling resistance, leading to higher fuel consumption. Proper tyre maintenance can help maximise fuel efficiency and extend the lifespan of your tyres, providing better value over time.
The width of the tyre also plays a role in fuel efficiency. Narrow tyres generally have lower friction, resulting in reduced fuel consumption. Wider tyres provide more friction, causing the vehicle to consume more fuel. Choosing the appropriate tyre width for your vehicle can help optimise fuel efficiency and potentially save costs.
When considering tyre cost and value, it's essential to balance upfront costs with long-term savings. While cheaper tyres may seem more attractive initially, investing in higher-quality, fuel-efficient tyres can provide better value over their lifespan. Additionally, factors such as grip, wet rating, and driving conditions should also be considered to ensure the tyres meet your specific needs and provide the best overall value.
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Frequently asked questions
Fuel-efficient tyres can make a difference to your vehicle’s fuel consumption. Some sources say that you can save hundreds of litres of fuel over the lifespan of your tyres. The difference between A and G in fuel efficiency is 7.5%, so if you do around 50 mpg with fuel costing £1.70 a litre for 10,000 miles a year, you can expect to spend £1,550 on fuel. The 1.25% saving on that would work out to be around £19 in total for a full set per year.
The condition and wear of your tyres can significantly impact your vehicle’s fuel consumption. Tyres that are overinflated or underinflated can increase rolling resistance, leading to increased fuel consumption. The width of the tyre also matters, with wider tyres providing more friction and consuming more fuel, while narrower tyres cause the car to consume less fuel.
To ensure your tyres are fuel-efficient, you should check your tyre pressure at least once a month and ensure they are inflated to the correct pressure. The correct tyre pressure for your vehicle can be found in your vehicle's manual, on a sticker inside the driver's door, or online by entering your registration number.
