If you’ve noticed that your vehicle’s gas mileage has dropped, you’re not alone. Many drivers are surprised when they suddenly find themselves at the pump more often than usual. A drop in miles per gallon can lead to more than just increased fuel costs, it can signal an underlying issue with your car that might need attention.
Understanding the reasons behind poor fuel economy can help you save money and prevent larger mechanical problems down the road. Let’s look at some of the most common causes of low MPG and what you can do to address them.
Low Tire Pressure
One of the simplest and most overlooked causes of decreased fuel efficiency is your tires. Underinflated tires create more rolling resistance, which means your engine has to work harder to keep the car moving. This directly reduces your MPG. Cold weather can cause tire pressure to drop, so it’s a good idea to check them regularly.
Driving Habits
The way you drive plays a significant role in fuel efficiency. Sudden acceleration, hard braking, and speeding all put extra demand on your engine. Consistent, smooth driving can boost your MPG significantly. Idling your vehicle for long periods is another common habit that burns fuel without getting you anywhere. Avoid excessive warm-up time, especially with modern engines that don’t require much idling.
Engine Problems
When your engine isn’t operating properly, it often uses more fuel to compensate. Worn spark plugs, clogged fuel injectors, or malfunctioning oxygen sensors can all cause inefficient combustion. If your check engine light is on, it’s best to have it diagnosed promptly. Many issues that affect performance also hurt fuel economy.
Air Filter and Fuel System
A clogged air filter restricts airflow into the engine, making it harder for the engine to “breathe.” Without enough oxygen, your car can’t burn fuel efficiently, leading to lower MPG. Replacing a dirty air filter is a quick and affordable fix. Similarly, a dirty fuel system, especially the fuel injectors, can interfere with the proper fuel-air mixture, reducing combustion efficiency.
Old Motor Oil
Oil lubricates your engine and reduces friction. As oil ages, it becomes dirty and thick, making your engine work harder. This not only increases fuel consumption but can also cause long-term engine wear. Following your vehicle’s recommended oil change interval helps maintain both fuel economy and engine health. Using the right type of oil is also important to ensuring your engine is running as efficiently as possible.
Excess Weight and Drag
Extra weight in your vehicle reduces MPG. Carrying around unnecessary items in the trunk or installing roof racks and cargo carriers can weigh down your vehicle and increase wind resistance. Roof boxes in particular can significantly reduce aerodynamic efficiency at highway speeds. Remove them when not in use, and travel as light as possible.
Short Trips and Cold Starts
If most of your driving consists of short trips, especially in colder temperatures, your engine may not reach its optimal operating temperature. Cold engines burn more fuel, and short trips don’t allow the vehicle to warm up enough to run efficiently. Combining errands into one longer trip can help improve MPG by keeping your engine warm and operating efficiently for a longer period.
Fuel Quality
Not all gasoline is created equal. Low-quality fuel may not burn as cleanly, leading to carbon deposits and reduced engine efficiency over time. While top-tier gasoline may cost a bit more, it often includes detergents that keep your fuel system cleaner, supporting better fuel economy.
Climate Control Use
Running the air conditioner puts additional strain on your engine, particularly in hot weather or stop-and-go traffic. While you don’t need to suffer in the heat, try using the A/C more sparingly or relying on the ventilation system when driving at lower speeds. In cold weather, seat warmers and defrosters can also draw extra energy, though their impact is usually less significant than A/C.
Fuel System Services in Florissant, Missouri
Low MPG is more than a financial concern, it’s a sign that something in your vehicle isn’t running as efficiently as it should. By paying attention to your car’s behavior and keeping up with routine maintenance, you can improve fuel efficiency and extend the life of your vehicle.
Don’t let efficiency issues linger and cost you more at the pump, have your vehicle inspected and repaired by the fuel system and powertrain experts at Gary’s Auto Service in Florissant, Missouri. Our team has extensive experience in providing fuel system services on all makes and models. Give us a call or schedule online today!