Ameer Randolph
The use of roof racks for bicycles can negatively impact a car's fuel economy. According to a test conducted by WhichCar, a 100km run on a Subaru Forester without any racks or cargo consumed 6.46 litres of petrol. The publication also noted that the average Australian who drives 15,000 km a year with a bike carrier attached can expect to pay an additional $127 per year. Similarly, a test conducted by Consumer Reports found that a bike rack had a significant impact on the fuel economy of a sedan, while an SUV was less affected. Another source suggests that a roof rack can increase fuel consumption by up to 25%. However, it is important to note that the way a person drives and proper maintenance of the car and bike can also impact fuel efficiency.
| Characteristics | Values |
|---|---|
| Impact on fuel economy | A 2019 Nissan Altima sedan saw a significant reduction in fuel economy with a loaded bike rack. An empty roof rack also impacted fuel economy. |
| Fuel savings from electric vehicles | The additional fuel consumption caused by roof racks is about six times larger than the anticipated fuel savings from fuel cell vehicles and 40% of the anticipated savings from battery-electric vehicles by 2040. |
| Increase in fuel bill | An extra 94 litres of petrol per year, resulting in an extra $127 per year for an average Australian driving 15,000 km with a bike carrier. |
| Gas mileage impact | Negligible impact on gas mileage. The way a person drives would affect mileage more than the added weight. |
| Fuel economy impact of different vehicles | Sedans are more affected by loaded bike racks than SUVs. An SUV's mileage showed a drop from 41 mpg to 40 mpg with an empty roof rack, while a rack alone dropped an Accord's mileage from 42 mpg to 37 mpg at 65 mph. |
| Fuel economy tips | Proper gear usage, cruising at a steady speed, coasting, accelerating and braking steadily, and maintaining engine aeration can help reduce fuel consumption. |
| Environmental impact | Choosing a bike over a car can significantly reduce carbon emissions and improve air quality. |
| Cost savings | Bikes have lower maintenance costs than cars, saving money on gas, oil changes, tire rotations, insurance, and payments. |
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What You'll Learn
Fuel economy is impacted by loaded bike racks
Tests conducted on a 2019 Nissan Altima sedan and a 2019 Toyota RAV4 small SUV revealed notable differences in fuel economy when the vehicles were equipped with loaded bike racks. The sedan experienced a substantial decrease in fuel efficiency, while the SUV was less affected, showcasing the disparity in how different vehicles are influenced by loaded bike racks.
The type of bike rack used also plays a role in fuel economy. For instance, an empty roof rack can decrease fuel efficiency by up to 15%, and the addition of bikes or luggage further exacerbates this issue. Hitch racks, on the other hand, have a negligible impact on fuel economy, even when loaded, and are easier to remove when not in use, making them a more fuel-efficient option.
Furthermore, the way a vehicle is driven can also influence fuel economy when using a loaded bike rack. Aggressive driving, excessive idling, and improper gear usage can all contribute to increased fuel consumption. To mitigate these factors, it is recommended to drive smoothly and steadily, avoid unnecessary idling, and utilize higher gears at lower speeds.
In summary, loaded bike racks can impact fuel economy, particularly on smaller cars, due to increased aerodynamic drag and weight. The choice of bike rack and driving habits also play a role in fuel efficiency. By selecting the appropriate rack and adopting fuel-efficient driving practices, individuals can minimize the impact of loaded bike racks on their vehicle's fuel economy.
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Aerodynamic drag increases fuel consumption
Aerodynamic drag is a major factor in the fuel efficiency of vehicles. The force of drag depends on the velocity, frontal area, and coefficient of drag of the body. As federal standards for fuel economy increase and fuel costs rise, reducing aerodynamic drag becomes crucial for automakers. The design and shape of a vehicle play a significant role in minimizing drag. For example, cars generally have a lower coefficient of drag (Cd) than SUVs and pickups due to their lower height, smaller size, and different cooling requirements.
Cooling requirements, in particular, can increase drag as they necessitate airflow into the vehicle through the radiator. Automakers are constantly working to improve aerodynamics to meet fuel economy standards and reduce costs. They subtly shape vehicles to reduce drag, and certain design features, such as spoilers and diffusers, are used to manage airflow and decrease drag.
The impact of aerodynamic drag on fuel consumption is significant. It is estimated that drag consumes about half of a vehicle's energy. As a result, improving aerodynamics can lead to notable improvements in fuel economy. For instance, the average fuel economy improvement from aerodynamic enhancements ranges from 0.1 to 0.3 mpg.
While this discussion focuses on the impact of aerodynamic drag on fuel consumption in vehicles, it is worth noting that choosing a bicycle over a car can significantly reduce fuel costs and carbon emissions. According to research, opting to cycle instead of drive just once a day can lower an individual's transportation-related emissions by 67%. This is because cycling has a much lower carbon footprint per mile traveled than driving a car.
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Hitch racks have a negligible impact on fuel economy
Hitch racks are attached to the rear hitch receiver of a vehicle, extending its cargo capacity. They are commonly used for carrying bikes, coolers, and camping gear. While any additional attachment to a vehicle will have some impact on fuel efficiency, hitch racks have been found to have a negligible impact on fuel economy compared to roof racks.
Consumer Reports found that using a rooftop cargo box can reduce fuel economy by up to 25%. This is because roof racks increase drag and create more wind resistance, which reduces fuel efficiency. Hitch racks, on the other hand, generally cause less aerodynamic drag.
The U.S. Department of Energy's Office of Energy Efficiency & Renewable Energy (EERE) discovered that a full rooftop cargo box reduced fuel economy by up to 25%. In contrast, a rear cargo tray, or hitch rack, only reduced fuel efficiency by 1%.
In addition, hitch racks are easier to remove than roof racks. Removing a roof rack when it's not in use can improve fuel economy. However, hitch-mounted bikes can be expensive to install and require drilling into the vehicle's frame.
Overall, while any additional cargo will impact a vehicle's fuel efficiency, hitch racks have been shown to have a negligible impact on fuel economy compared to other options, such as roof racks.
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Proper tyre pressure improves fuel efficiency
While having a bike on your car may reduce fuel efficiency, there are other factors to consider when looking at ways to improve fuel efficiency and reduce emissions. One simple way to improve fuel efficiency is to maintain the proper tyre pressure.
Tires naturally lose 1 pound per square inch (PSI) of pressure per month, and for every 1 PSI drop in pressure, you lose about half a percentage point of efficiency in your fuel economy. This can be easily avoided by regularly checking the air pressure and ensuring your tyres are inflated to the recommended pressure. The proper tyre pressure for your vehicle can usually be found on a sticker in the driver's side door jamb or the glove box, as well as in your owner's manual. It is important to note that the PSI stamped on the wall of the tire is the maximum air pressure and not the optimum pressure.
Maintaining the proper tyre pressure will not only improve fuel efficiency but also enhance performance, durability, and safety. Under-inflated tires can lower gas mileage and are less safe, while over-inflating tires can potentially damage them. Temperature changes throughout the day can also affect tyre pressure, so it is important to check regularly.
By keeping your tires inflated to the proper pressure, you can improve your gas mileage by 0.6% on average and up to 3% in some cases. This simple routine of inspecting your tires and maintaining the proper PSI could save you hundreds of dollars over the life of the tires.
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Sedans are more affected by loaded bike racks than SUVs
While choosing to cycle instead of drive can significantly reduce your carbon footprint, there are times when driving is unavoidable. For those occasions when you need to transport your bike, it's worth considering how carrying a bike on your car can affect its fuel efficiency.
Tests by Consumer Reports found that a loaded bike rack had a significant impact on the fuel economy of a 2019 Nissan Altima sedan, while a 2019 Toyota RAV4 small SUV was much less affected. Even an empty roof rack on the Nissan Altima resulted in a large reduction in fuel economy, whereas the Toyota RAV4 was relatively unaffected by either rack type.
The reason for this discrepancy lies in aerodynamics. Car manufacturers design their vehicles to be as aerodynamically efficient as possible, but adding a bike rack interrupts the flow of air, creating drag. This drag causes resistance, which requires energy to overcome – energy that comes from your fuel tank. The more streamlined the underlying vehicle, the less impact a bike rack will have on its fuel efficiency.
SUVs tend to be larger and boxier than sedans, which are typically lower and more streamlined. As such, a bike rack is likely to create more drag on a sedan than an SUV, resulting in a greater reduction in fuel efficiency. Therefore, if you're planning on transporting bikes regularly, it's worth considering the potential impact on your fuel costs, especially if you own a sedan.
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Frequently asked questions
Having a bike on your car can reduce fuel economy by quite a bit. According to one source, an empty roof rack can add up to 15% to your fuel bill, while another source states that driving with a bike carrier attached can cost the average Australian an extra $127 per year.
The type of car and the speed at which you're driving influence the impact of a bike rack on fuel economy. For example, a 42 mpg Accord drops 5 mpg at 65 mph, while an SUV showed less of a drop, going from 41 mpg to 40 mpg at the same speed.
Yes, you could consider a trunk-mounted bike rack or a hitch-mounted bike rack. A hitch rack is easier to remove and will save fuel no matter what type of vehicle you drive.
According to AAA, the average cost of owning and maintaining a vehicle driven 15,000 miles a year is nearly $10,000. By choosing to bike instead of drive, you can cut down on these expenses, as well as lower your carbon footprint.
