Step 1: Watch an Overview Video

Step 2: Make Sure the Gas Cap is Tightened

Clicking the gas cap three times prevents gas in your tank from vaporizing. Loose gas caps in the US allow 147 million gallons of fuel to vaporize every year. Removing all possible weight from the trunk will also increase gas mileage. Extra weight inside a vehicle wastes fuel.Window film can reduce temperatures inside your vehicle. This means less need for air conditioning and better mileage. Check local laws before installing.

Step 3: Add Fuel Injector During Oil Changes

Every time you change your oil, add fuel injector cleaner to your gas tank to improve fuel delivery. If fuel injectors are worn out, replace them. Unplug fuel pump and let the car idle until the engine dies. Remove the upper half of intake manifold then stuff rags into intake ports. Unplug and unbolt all injectors and disconnect fuel lines. Cut injectors off the rail; press new injectors into the rail; put in new o-rings and torque to the manufacturer’s recommendation. Replace all fuel lines and fuel filter. Clean manifold halves; remove rags and replace upper half of intake manifold.

Step 4: Inflate Tires and Shut off the Engine

Inflate tires to the manufacturer’s standard. Low pressure can decrease gas mileage up to 15 percent. Using the manufacturer’s recommended engine oil improves engine efficiency, especially when using synthetic oil.

Finally, turning off your engine for short periods of time, saves gas. Idling for 15 seconds uses more gas than restarting the engine. In vehicles made before 1996, one minute of idling equals the gas used for an engine startup. Do not warm up your engine, even on cold mornings: an idling engine wastes gas.