Check the air pressure in each tire and if there are any tires with either too much or too little tire pressure, then correct it by either adding or reducing the air pressure until it is at the recommended air pressure as marked on each tire.

Reduce Weight

The more that the car weighs, then the less mileage the automobile will get per gallon of gas. Reduce weight by removing any extra loads from inside the automobile or the trunk.

Engine Tune-up

When car parts get old, then they start failing to do what they were designed to do and the failure of these parts can lead to poor gas mileage among other things. Get a tune-up at least once a year, so that the belts, spark plugs and spark plug wires can be replaced if needed.

Fuel Filter

A bad fuel filter can cause poor gas mileage, so it is important to have it checked out by someone who knows what to look for and replace it if needed.

Air Filter

Routinely, check the air filter to make sure that it is clean. The air filter cleans the air that circulates through the in-take of the fuel system and if it becomes dirty, then it could cause the engine to get less air and could lead to poor performance and less gas mileage.

Avoid Idling

Idling while in slow moving traffic or in a fast food drive-in are the worst culprits of poor gas mileage, because idling continues to burn gasoline whether the car's moving or not. Turn the engine off if parked or waiting for a train to pass, so not to idle as you wait.

Mapping

Planning long road trips can save gas and time on the road and this prudent planning can solve the same travel problems that many commuters face, just going to work and back. Avoiding road construction, traffic bottlenecks and wrecks check the local traffic reports on the radio, television or Internet, before hitting the road.

Reduce Speed

The faster that the car is moving, then the more fuel that is being used. The ideal top end travel speed is 55 mph on the highway and traveling any faster would reduce the mileage per gallon of fuel. Slow down and relax.

Smart Shopping

Not anymore is it smart to visit multiple stores to save a few extra dollars on the things that you buy, because with gas prices shattering records everyday it simply cost more to drive different places to just buy things on sale. Visiting local malls and shopping centers can reduce the amount of driving that will be needed and most malls/shopping centers carry just about everything that most people could ever need.

Car Pooling

Share a ride with a co-worker or friend on the drive to work, home or shopping. This will not directly increase the fuel mileage regarding the vehicle being used, but taking turns driving will save money in the long run.