Sylvie Willis
Muscle cars are typically associated with high-powered engines and thrilling speeds, but with growing environmental concerns, automakers are now also focusing on improving their fuel efficiency. While some modern muscle cars, like the BMW M4, Jaguar F-TYPE, and Mercedes AMG C63 S, offer a balance of power and efficiency, owners of classic muscle cars can also make tweaks to maximise their vehicle's fuel economy. This includes routine maintenance, such as ensuring proper tyre pressure and regular oil changes, as well as installing new parts like air filters and electronic ignition conversions. Additionally, driving style plays a significant role, with gentle acceleration and reduced braking contributing to better fuel efficiency.
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What You'll Learn
Opt for a smaller engine
Opting for a smaller engine is a viable option when it comes to improving the fuel efficiency of a muscle car. While it was once believed that smaller engines were the key to better fuel efficiency, this is not always the case today due to advancements in engine technology. However, smaller engines still play a significant role in achieving acceptable fuel economy.
In the past, powerful cars with large engines, including American muscle cars, were notorious for their high fuel consumption. As a result, economy-oriented family cars were typically equipped with smaller engines to enhance fuel efficiency. Today, modern engine technology has evolved, and larger engines built with advanced technology can sometimes be as efficient as, or even more efficient than, smaller engines from previous years.
Despite this, smaller engines still have a role to play in improving fuel efficiency. For example, the popular Ford Mustang, one of the best-selling small-engine muscle cars, is powered by Ford's 289 engine, which has a relatively small displacement of 289 cubic inches. While it may not offer the same horsepower or torque as larger engines, it is still a high-performing vehicle and can be more fuel-efficient.
When considering a smaller engine, it is important to keep in mind that a small, low-powered engine paired with a larger-sized car can lead to subpar fuel consumption. This is because the smaller engine may be overworked, causing it to operate outside of its most efficient zone. Therefore, it is crucial to strike a balance between engine size and vehicle size to optimize fuel efficiency.
Additionally, modern automatic gearboxes can also play a role in improving fuel economy. By lightening the load on the engine, they can enhance fuel efficiency, further supporting the case for smaller engines in certain contexts. In summary, while smaller engines may not always guarantee better fuel efficiency, they can contribute to improved fuel economy, especially when combined with modern engine technology and appropriate vehicle sizing.
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Reduce the weight of your car
Reducing the weight of your muscle car is one of the most effective ways to improve fuel efficiency. The lighter the vehicle, the less fuel it requires to accelerate and maintain speed. Here are some ways to reduce the weight of your muscle car:
Remove Unnecessary Items
First, remove any unnecessary items from your car. This includes items in the boot, trunk, and passenger seats. Consider what you truly need for your journey and leave the rest behind. Even an extra 100 pounds in the trunk can reduce fuel economy by 1-2%. So, pack only what is essential and make your muscle car as light as possible.
Choose Lighter Wheels
Consider switching to narrower tires. Running narrower tires will reduce rolling resistance, which will improve fuel economy. When replacing tires, opt for those with a higher economy rating. Modern tires have an economy rating that indicates their impact on fuel efficiency. Choosing tires with a higher economy rating will help you travel further per litre or gallon of fuel.
Remove Roof Racks
If you have roof racks, consider removing them if they are not in use. Roof racks create wind drag, increasing fuel consumption and emissions. By removing them when not in use, you can reduce the overall weight and drag of your vehicle, resulting in improved fuel efficiency.
Opt for Lightweight Modifications
When modifying your muscle car, consider the weight of any additions. Look for lightweight alternatives or modifications that can enhance performance without adding significant weight. This could include lightweight body panels, wheels, or performance parts specifically designed to reduce weight without compromising strength or durability.
Maintain a Clean Interior
Keep the interior of your muscle car clean and free of clutter. Over time, it's easy for items to accumulate in the cabin, adding unnecessary weight. Make it a habit to remove any unnecessary items from the cabin, including the glove compartment, centre console, and door compartments. A clean and organised interior will contribute to weight reduction and improved fuel efficiency.
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Keep your tires inflated to the correct pressure
Keeping your tires inflated to the correct pressure is an essential step in improving your muscle car's fuel efficiency. Under-inflated tires can significantly impact your vehicle's fuel economy, causing a noticeable drop in gas mileage. By ensuring your tires are inflated to the optimal level, you can minimize the amount of fuel consumed and contribute to environmental sustainability while also saving money.
Tire pressure is measured in pounds per square inch (PSI), and the recommended pressure for most vehicles falls between 30 and 35 PSI. However, it's important to note that the ideal tire pressure can vary depending on the vehicle's make and model. You can find the specific recommended tire pressure for your muscle car in the owner's manual or on a sticker located on the driver's side door jamb or glove box door. Checking the tire pressure is a simple task that can be performed with a tire pressure gauge, which directly measures the PSI of your tires.
Maintaining the correct tire pressure offers several benefits. Firstly, it reduces rolling resistance. Higher tire pressure results in less rolling resistance, which means your engine has to work less to move the car, leading to improved fuel efficiency. Secondly, proper tire pressure minimizes unwanted movement of the rubber, reducing friction and conserving energy. This, in turn, helps optimize the power delivered to the wheels, enhancing fuel economy.
It is advisable to check your tire pressure regularly, especially during extreme weather changes, as temperature fluctuations can significantly affect tire pressure. Digital tire pressure gauges are highly accurate and easy to use. Additionally, investing in a quality tire inflator with a built-in gauge will help you maintain the optimal tire pressure. Remember, it is best to check and adjust tire pressure when your tires are cold, as pressure increases as the tires heat up from driving.
By keeping your tires inflated to the correct pressure, you can not only improve your muscle car's fuel efficiency but also reduce unnecessary tire wear and enhance your safety on the road.
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Install electronic ignition
Upgrading to an electronic ignition system can be a great way to improve the fuel efficiency of your muscle car. This is because an electronic ignition system does not require as much fuel to start and accelerate your engine, leading to reduced fuel costs and emissions. Additionally, electronic ignition systems have fewer moving parts, making them more reliable and easier to maintain.
If you own a pre-1974 muscle car with a points-type distributor, you can benefit significantly from switching to an electronic ignition system. The process of converting to an electronic ignition system is relatively straightforward and can be completed in less than 15 minutes by a trained technician. It is also possible to perform the conversion yourself if you have some mechanical skills, which will further reduce costs.
To begin the installation process, you will need to disconnect the battery and remove the distributor cap. The next step is to remove the traditional condenser and points by unscrewing them from the distributor base-plate. This step may vary depending on the specific type of electronic ignition system you have chosen. Some types bolt under the distributor cap, while others have a separate amplifier. It is important to ensure that you have selected the correct kit for your car's polarity and that the engine is correctly timed.
Once the old parts have been removed, clean the distributor and lubricate its shaft with a drop of oil. Fit the module mounting plate to the dizzy, ensuring that it locates on the brass pin that the points used to pivot on. Secure it with the provided screw. Then, attach the electronic unit to the mounting plate using another screw. Feed the wires from the module around the inside of the distributor and through the new plastic side plug.
Finally, gently rotate the distributor base-plate to ensure that the wires are not pulled tight when the vacuum advance is operating. Reconnect the battery and test the timing. You may also want to test drive your car over the same route before and after the installation to compare performance.
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Choose a suitable transmission
When it comes to choosing a suitable transmission for your muscle car to improve its fuel efficiency, there are a few things to consider. Firstly, it is important to understand that the transmission plays a significant role in determining fuel economy. Upgrading to a more modern and efficient transmission with overdrive can make a noticeable difference. This is because overdrive allows your engine to turn significantly slower at higher speeds, resulting in reduced fuel consumption. Additionally, modern transmissions often have less rpm drop between gear changes, leading to better acceleration.
If you own a classic muscle car, consider installing a new manual transmission with overdrive. Modern Driveline offers complete manual five- and six-speed transmission packages, while Gear Vendors provides bolt-on overdrive packages for vintage cars with manual or automatic transmissions. These upgrades will not only improve fuel efficiency but also enhance your vehicle's performance.
Another factor to consider is the type of engine in your muscle car. While smaller engines generally tend to be more fuel-efficient, they may not provide the same horsepower or torque as their larger counterparts. If you're looking for a balance between performance and fuel economy, consider opting for a popular fuel-efficient muscle car from the 1960s or 1970s that uses a smaller V8 engine. These vehicles offer high performance while being more efficient than their large-engine-driven cousins.
Additionally, maintaining proper engine maintenance is crucial for optimizing fuel efficiency. This includes regularly changing the transmission fluid, as recommended by the manufacturer, to reduce strange sounds and keep your car running smoothly. It is also important to periodically check and clean your carburetor, as well as inspect your exhaust system for any leaks that may reduce power and affect fuel efficiency.
Finally, driving style and habits can significantly impact fuel efficiency. Gentle and deliberate driving, maintaining a steady speed, and avoiding excessive acceleration or high speeds can help improve fuel economy. Additionally, reducing unnecessary weight in your vehicle can also contribute to better fuel efficiency, especially in city driving conditions.
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Frequently asked questions
There are several ways to improve the fuel efficiency of a muscle car. Firstly, ensure that your car is well-maintained, with regular oil changes, clean oil, and replacement fuel and air filters. Keep your tires inflated to the proper pressure, and reduce the weight of your ride where possible. If you're looking to buy a muscle car, consider choosing one with a smaller engine, as these tend to be more fuel-efficient.
The Hyundai Genesis Coupe is a good option for power and efficiency, with 348 horsepower and an 8-speed automatic that gets 16/25 MPG. The Mercedes SLK300 can reach 32 MPG, while the AMG C63 S offers 503 horsepower and 18/25 MPG. The BMW M4 offers lightning-quick acceleration and 17/26 MPG. The Nissan 370Z NISMO is another option that delivers serious power.
The engine has a significant impact on fuel efficiency. Smaller engines tend to be more fuel-efficient, but they may not provide the same horsepower or torque as larger engines. The Chevrolet 350 engine, for example, can deliver over 300 horsepower but may only get between 10 to 17 miles per gallon.
Yes, there are several modifications you can make to improve fuel efficiency. You can install electronic-ignition conversions to reduce fuel loss from spark plug misfires. Upgrading to a crate engine can boost horsepower without requiring costly individual engine part replacements. You can also optimize the drivetrain, improve the intake/exhaust, and tune the carb or install EFI for better fuel economy.
Driving style plays a crucial role in fuel efficiency. Aggressive driving and frequent braking can increase fuel consumption. By driving smoothly and deliberately, you can significantly improve fuel economy, even in vehicles with poor fuel efficiency ratings.
