Rajan Wilcox
When the temperature drops, fuel economy decreases. This is due to a combination of factors, including denser cold air, which increases aerodynamic drag, and the use of heaters, defrosters, headlights, and wipers, which all consume fuel. To prevent fuel system corrosion and engine damage caused by water droplet formation, it is recommended to keep your gas tank at least half full during the winter. This is especially important for diesel-powered vehicles. Additionally, a full tank of non-ethanol fuel can prevent moisture from condensing and causing stale fuel and corrosion.
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What You'll Learn
A full tank prevents moisture and corrosion
A full tank of gas can help prevent moisture and corrosion in your vehicle during the winter. When there is space in your gas tank not occupied by gasoline, condensation can occur. This is because cold water vapour comes into contact with a warmer surface, similar to the fog that appears on the inside of a vehicle's windshield on a cold day. This condensation can lead to corrosion in your engine.
Gasoline is relatively slow to warm up, and will help keep the air cool. Drops of water can form on the inside walls of your gas tank, sliding down and sinking to the bottom of the tank. As water is heavier than gas, it will sink to the bottom of the tank and can be drawn into the engine, leading to corrosion.
A full tank of gas won't have as much headspace and won't breathe as much. This means there is less opportunity for condensation to form. This is especially important in winter, when the cold weather can cause gasoline to freeze in the fuel lines, preventing it from reaching the engine.
It is also beneficial to fill up your tank with non-ethanol fuel if you can. Non-ethanol fuel is less likely to absorb moisture from the atmosphere than ethanol-enriched fuel. While ethanol can act as an antifreeze, it cannot stop condensation from forming or reaching your fuel lines.
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Warmer vehicles require more fuel
Secondly, in cold weather, the engine struggles to reach its optimum operating temperature, and this results in a reduction in fuel economy. The engine runs on a mixture of air and petrol, and when it is cold, it consumes more fuel to maintain the same volume. For example, when the temperature is -5° C, a vehicle's fuel consumption increases by approximately 10% compared to 20° C.
Thirdly, winter driving conditions can also impact fuel economy. For instance, icy or snow-covered roads decrease tire grip, wasting energy and reducing fuel efficiency. Additionally, driving on snow or mud forces the engine to use more power, further increasing fuel consumption.
Finally, during the winter, you are more likely to use additional features that consume fuel, such as the heater, defroster, headlights, and wipers. All of these functions contribute to higher fuel usage.
To mitigate these effects, there are several strategies you can employ. Firstly, avoid idling your vehicle to warm it up; instead, drive gently after about 30 seconds to allow the engine to warm up faster and decrease fuel costs. Secondly, minimize the use of seat warmers and defrosters, and opt for a scraper or de-icer to clear your windscreen. Thirdly, regularly check your tire pressure and keep your tires properly inflated, as under-inflated tires increase rolling resistance and negatively affect fuel consumption. Additionally, removing accessories that increase wind resistance, such as roof racks, can help improve aerodynamics and reduce fuel usage.
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Cold air is denser, increasing drag
Cold weather and winter driving conditions can significantly reduce fuel economy. Fuel economy tests show that a conventional gasoline car's gas mileage is roughly 15% lower at 20°F than at 77°F. The effect is more pronounced for short trips, with fuel economy dropping by as much as 24% for trips of 3 to 4 miles. The impact of cold weather varies by vehicle model, but conventional gasoline vehicles typically experience a 10-20% fuel economy loss in city driving and a 15-33% loss on short trips.
One of the reasons for this decrease in fuel economy is that cold air is denser, increasing aerodynamic drag on a vehicle, especially at higher speeds. When a car accelerates, it faces more air resistance in cold air because the cold air contains more mass per volume for each particle. Drag is proportional to density, so denser, colder air produces more drag than warmer, lighter air. This increased drag requires more energy to overcome, resulting in higher fuel consumption.
The impact of cold, dense air on drag is particularly significant for trucks due to their size and weight, making pressure drag a notable issue. The U.S. Department of Energy found that 85% of the useful energy produced by a truck engine is used to overcome aerodynamic drag and rolling resistance. As a result, operating in cold conditions with denser air further magnifies the aerodynamic drag, creating a significant drain on fuel economy.
To mitigate the effects of denser air on drag and fuel economy, several measures can be considered. Firstly, it is important to minimize idling to warm up the car. Manufacturers typically recommend driving off gently after about 30 seconds, as the engine will warm up faster when in motion, reducing fuel costs and emissions. Additionally, removing accessories that increase wind resistance, such as roof racks, when not in use can help reduce drag.
Furthermore, ensuring that your gas tank is topped up during the winter can be beneficial. A full tank prevents moisture from condensing, which can lead to stale fuel and corrosion. Additionally, keeping the tank full helps to keep the air pump cool and prevents water or ice particles from causing potential damage. However, it is worth noting that the impact of cold, dense air on fuel economy is influenced by various factors, including vehicle model, driving conditions, and speed.
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Tyre pressure decreases in cold weather
It is generally recommended to keep your gas tank topped up in winter, especially if your car runs on diesel fuel. This is because condensation occurs when colder water vapour comes into contact with a warmer surface, and a full tank prevents moisture from condensing in the tank. This condensation can lead to stale fuel and corrosion. Additionally, a steady stream of gasoline helps keep your air pump cool, and a full tank will provide plenty of fuel to help warm your car if you get stranded.
Now, onto the topic of tyre pressure:
As the temperature drops, so does tyre pressure. This is because the molecules in the air move slower and huddle together, causing the air to become denser and consequently lower the tyre pressure. This can affect your driving in several ways:
- Increased stopping time: Underinflated tyres can increase braking time and make your vehicle skid more easily on wet roads.
- Poor fuel economy: Underinflated tyres can lower gas mileage. The U.S. Department of Energy notes that underinflated tyres can lower gas mileage by about 0.2% for every 1 PSI drop in the average pressure of all tyres.
- Decreased tyre lifespan: Underinflation can decrease the lifespan of your tyres and make them more vulnerable to damage, leading to more frequent tyre replacements.
To maintain optimal tyre pressure in cold weather, it is recommended to check your tyre pressure at least once a month, preferably once every two weeks. It is also important to note that a tyre pressure warning light on a chilly morning does not necessarily indicate a puncture but rather that your tyres need to be topped up as soon as possible. When checking your tyre pressure, ensure your tyres are cold for a more accurate reading. You can check your vehicle's handbook to find the minimum amount of air pressure needed in cold tyres to support your vehicle.
It is important to be vigilant about checking and maintaining proper tyre pressure during the winter months to ensure safe driving conditions and optimal fuel economy.
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Condensation can occur in the fuel tank
Condensation can occur in a fuel tank when colder water vapour comes into contact with a warmer surface. This can happen in your fuel tank as there is air in any space in your fuel tank not occupied by gasoline. Gasoline is relatively slow to warm up and will help keep the air cool. Just like the drops of water that form on the inside of a cold glass, water droplets can form on the inside walls of your fuel tank, where they eventually slide down. Because gasoline and water do not mix well, and water is heavier than gas, those beads of water that drop into your gasoline sink to the bottom. From there, they can be drawn into the engine and lead to corrosion.
However, this is a hotly debated topic, and some people argue that condensation in fuel tanks is a myth. They argue that for condensation to occur, the fuel tank must be much colder than the air. While the weather can turn cold very fast, it does not suddenly get very warm. Gasoline absorbs heat and cold slowly, so one might expect to see sweating on the outside of a tank as the day warms up from a cold morning, but this is rarely observed.
Another argument against condensation in fuel tanks is that modern cars are designed differently. Modern fuel injection systems don't have low-pressure areas or potential gaps where air can collect. However, this does not prevent water from condensing in the gas tank in the first place. Canadian law requires a minimum of 5% ethanol in gasoline, and while ethanol can act as an antifreeze, it cannot stop condensation from occurring or prevent it from reaching your fuel lines.
To prevent condensation in your fuel tank, it is recommended to keep your tank topped up, especially in winter. A full tank won't have as much headspace and won't breathe as much, preventing moisture from condensing. It is also recommended to fill up with non-ethanol fuel, as it is less likely to absorb moisture from the atmosphere.
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Frequently asked questions
Keeping your fuel tank full in winter is important as it prevents condensation from forming inside the tank and the fuel lines leading to the engine. This condensation can lead to fuel-system corrosion and damage.
It is recommended to keep your gas tank topped up, or at least half full, during winter.
To reduce fuel consumption, avoid letting your car heat up for too long to de-ice your windscreen in the morning. Instead, use a scraper or de-icer. Minimise the use of seat warmers and defrosters, and check your tyre pressure regularly.
Cold, dry air in winter is denser than in summer, which increases aerodynamic drag on a vehicle. Winter grades of gasoline can also have slightly less energy per gallon than summer blends.
