Why Do Cars Become Less Fuel Efficient as They Age? And Can It Be Fixed?
The fuel efficiency of cars often declines as they get older, but this does not necessarily mean you have to accept lower performance regardless of age. This article will explore why cars become less fuel efficient over time and provide actionable tips on how to maintain or improve fuel efficiency.
The Role of Proper Maintenance
Proper maintenance and keeping your vehicle in good repair can help maintain its fuel efficiency over its design life. Internal combustion engines (ICEs) are designed to maintain fuel efficiency, and with the right care, they can do just that.
Example: My 2007 Trail Blazer was a restoration project that initially lacked power and torque until I modified it. After addressing several issues, including treating it with Cylindralube Pro from Amazon, the engine shifted more efficiently and locked the torque converter, improving both power and fuel efficiency.
Age and Fuel Efficiency: Old Versus New Cars
Historically, older cars (pre-1970) experienced rapid piston wear, leading to a decline in compression and power, resulting in lots of blue smoke. At 30,000 miles, an old car's engine might require a new engine or new rings. In contrast, modern cars can easily surpass 150,000 miles without significant power loss. Most of my vehicles, sold with over 140,000 miles, do not experience noticeable blue smoke due to advancements in modern engineering.
Note on Repair Qualifications: If you own an old car, learning how to replace rings and bearings, or simply buying a new car, are the practical solutions.
Electric Vehicles (EVs) and Fuel Efficiency
Electric vehicles (EVs) present a unique scenario. Tires and aerodynamics are the primary sources of inefficiency. As tires wear down, they become more efficient, while new tires can decrease efficiency. This is not a property of all cars but a specific characteristic of internal combustion engines.
Advantages of EVs: EVs do not inherently experience the same wear and tear as internal combustion engines, resulting in consistent fuel efficiency. However, regular maintenance of battery health and tire condition is still necessary.
Factors Contributing to Declining Fuel Efficiency
Mileage is a significant factor contributing to the decline in fuel efficiency. In the beginning, an engine goes through a 'wearing-in' period where excessive friction and other factors lead to reduced efficiency. Once the engine is sufficiently broken in, it achieves the best fuel mileage. As the engine wears out, fuel usage increases, often due to worn parts that require more energy to produce the same power output.
Improving Fuel Efficiency: Use Iridium spark plugs Employ synthetic fluids Keep tires properly inflated Replace vehicle filters, spark plugs, and spark coils Carry as little extra weight as necessary Replace worn low rolling resistance tires with new ones
Driving Habits
Driving habits significantly impact fuel efficiency. Smooth acceleration, steady driving, and avoiding excessive idling can all contribute to better fuel economy. Additionally, removing unnecessary items from your vehicle, such as the passenger seat, can also reduce weight and improve efficiency.
Final Tips: Address any oil leaks promptly Regularly check and maintain tire pressure Replace worn parts, like spark plugs and belts Opt for synthetic lubricants Keep your vehicles filters and fluid levels up to date
By understanding the factors that contribute to declining fuel efficiency and implementing these maintenance tips, you can extend the life of your car while maintaining optimal performance.