![]() ![]() If you choose to use a lower rating, the ECU might adjust the ignition timing, known as dialing back or pulling timing. If you drive a high-end vehicle or sports model, you might be told to always use premium gasoline. Regular is rated at about 87 octane, while mid-grade is 89, and premium falls between 91 and 93. In some models, you can choose whether to use regular, mid-grade or premium octane fuel. The higher the octane rating is, the more resistance your vehicle receives. The octane rating illustrates the fuel’s capability to resist combustion when under pressure. RELATED: 5 Symptoms of a Bad Wheel Alignment 7. Instead, have the car realigned at the first sign of trouble. Not only will you spend more at the fuel pump, but you are going to get a workout every time you drive the car, trying to muscle it back onto the road. To maintain this extra energy, the vehicle is going to use more fuel. Bad Wheel AlignmentĪfter your vehicle hits a pothole, you might notice that it takes more effort to keep it moving forward. You can find this information on the sticker located on the driver’s door jamb. However, even if you are running the tires just slightly low so the sensors don’t notice, you could be wasting fuel.Ĭheck the tire pressures often and ensure they match the factory recommendations. With modern vehicles, there are tire pressure sensors that alert you to when you should add more air. To produce this energy, fuel economy drops. This resistance demands more energy from your car to maintain the given speed. When tire pressure is low, there is more rolling resistance to contend with. In some cases, you can clean the injectors, which saves you money over replacement. When the fuel doesn’t atomize correctly and mix with the right amount of air, combustion doesn’t occur as it should. If the fuel injector is clogged or defective, it could spray fuel, but not in the appropriate pattern. Clogged Fuel Injectorįuel injectors are needed to send fuel to the system at a specified time. RELATED: 6 Symptoms of Bad Spark Plugs 4. These issues can also lead to engine hesitation, stumbling, and a rough idle. However, this is true with any part of the ignition system, including the plug wires and ignition coil.įuel that hasn’t burned can’t be used to move the vehicle, so it goes wasted. If a spark plug goes bad, fuel in the affected cylinder might not combust properly, leading to poor gas mileage. The ignition system is vital to the combustion of the engine, and the spark plugs play a huge role. RELATED: 5 Symptoms of a Bad Oxygen Sensor 3. It can also increase the CO levels in the exhaust, hurting the environment. If there is a defective sensor, there could be more fuel being injected into the system than needed, which means you’re wasting gas. Many times, the car will continue to run normally or with some minor performance issues, even with a bad sensor, but you don’t want to ignore the fault. If the Check Engine Light comes on and reveals a bad O2 sensor, you want to replace it right away. Let your engine breathe better and increase the fuel economy, all with this simple replacement. In fact, you are probably spending more money by running the dirty air filter than it would cost to change it. For the cost of a new air filter, there’s no reason to procrastinate. If you can’t remember when it was changed last, it’s time to fix that. If you check the recommended service intervals for your vehicle, you will see engine air filter replacement listed. Dirty Air FilterĬhanging the engine air filter is considered a regular maintenance task. Without further ado, here is a more detailed list of the ten reasons your car isn’t getting great gas mileage. You also want to ensure you use the right fuel type with the right octane rating for your car. It can also be caused by a dirty air filter or low tire pressure. The most common cause of poor gas mileage is a faulty engine sensor like the O2 sensor, MAF sensor, or MAP sensor. ![]() Best Way to Improve Gas Mileage 10 Causes of Bad Gas Mileage ![]()
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