Choose the right octane.
If you are using an octane grade that is too low for your car, something other than the spark plug can ignite the fuel in the engine. If your car detects abnormal ignitions, its on-board computers will slow down the car’s timing so severe damage does not occur. This slowing down means you are no longer getting optimum engine performance or gas mileage.
Check your owner’s manual to learn about the correct octane for your car. Don’t upgrade to more expensive octane ratings unless your manufacturer recommends it.
Keep tires inflated to proper levels. Under-inflation means the tire is soft and the outside edges work harder than the softer center. The extra rolling resistance makes your car work harder to move and it reduces gas milage.
Be sure to check your tire pressure regularly, and maintain the recommended pressure listed in your owner’s manual. Also, you can usually find this recommended pressure on a sticker posted in the trunk, on the door pillar.
Don’t drive at high speeds.
Driving at 65 mph as opposed to 55 mph increases fuel consumption by 20%.
Change your air filter.
This is important because air is just as crucial as fuel in the combustion process that powers the engine. Air is drawn through the air filter, then the air intake manifold and into the cylinders. There, it mixes with fuel to create the small explosions that power your car.
A dirty air filter prevents the cylinders from drawing in enough air, and throws off the fuel/air mix. This can result in poor fuel economy.
Have your fuel system professionally cleaned.
Clogged or dirty injectors can impede engine performance and reduce fuel combustion efficiency. Carbon in the upper intake can greatly reduce airflow into the engine and reduce the atomization of fuel. This will rob your vehicle of power and fuel mileage.
Have your fuel filter replaced regularly.
Sand and other impurities can clog your fuel filter and starve your fuel injectors. Starved fuel injectors reduce engine performance and reduce fuel efficiency.
Have your engine tune-up performed regularly.
Proper engine spark is vital to the combustion process. As spark reduces, the fuel combustion temps are reduced and there is an incomplete fuel burn. This reduces fuel efficiency and power.
