1. Choose the right octane. If you are using an octane grade that is too low for your vehicle, something other than the spark plug can ignite the fuel in the engine. If your vehicle detects abnormal ignitions, its on-board computers will slow down the vehicle'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 vehicle's owner's manual to learn about the correct octane for your vehicle.
  2. Keep tyres 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 vehicle work harder to move and it reduces fuel economy. Be sure to check your tyre pressure regularly, and maintain the recommended pressure listed in your owner's manual. Also, you can usually find this recommended pressure on a sticker stuck to the drivers side door pillar
  3. Don't drive at high speeds. Driving at 65 mph as opposed to 55 mph increases fuel consumption by 20%.
  4. 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 vehicle. 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.
  5. Have your fuel system professionally cleaned. Dirt, sand and other impurities can clog your fuel filter and starve your fuel injectors. Starved or clogged fuel injectors can impede engine performance and reduce fuel efficiency.