Automobilicious

Well the number will be to Drive less and then there's Walk, bike, ride the bus or join a carpool.
First thing first you need to get Friction free 3000 is an oil additive that can improve your car performance.

Reduce your commute by moving closer to work or working closer to home. This will save time as well as money. You may even be able to save even more money by becoming one-car family.

Combine trips. If you can do several short trips in one longer trip, you will save fuel and time. Make lists to avoid having to go back. Call ahead to avoid wasted trips.

Walk between stops. Once you get into town, some of your stops may be near each other. Park between some or all of them and walk.

Park in the first spot you find. If you wander all over the parking lot looking for that really close parking space, you'll use more gas.

Don't be afraid to walk a ways if it comes to that - the walk will do you good!

Find good prices
Apply for a credit card which offers gas savings when you use the card for purchases. This works in much the same way that some credit card companies allow you to earn frequent flyer miles when you use their card for purchases.

Join a loyalty club. Some gas stations, department stores and grocery stores offer lower prices when you present their membership card, but keep your eyes open and verify that their prices are really lower than other stations in your neighborhood.

Check the web for deals. With the ever increasing gas prices, use the Internet to find the cheapest gas near you. Some of these sites even offer text messaging capabilities, where they will send you the a text message with the location of the cheapest gas in your area.
Here are 3 sites that enable you to search for lower price in your town: MapQuest, GasBuddy.com and gaspricewatch.com .

Use the lowest recommended octane for your car. The lower octane gas is cheaper. Most modern cars are engineered to run most efficiently on lower octane fuel, and often recommend not using higher-octane fuel.
Check your owner's manual to be sure, as not all car engines should use lowest octane gas.
Mix octanes.
In some areas, the lower octane may be too low for your car and the mid-grade or higher octane may be more than what you need. To avoid overpaying and still get the correct octane for your car you can mix the gas.
For example, if your car takes 87 octane and the pumps have 85 octane and 89 octane, then when filling your car, fill half the tank with 85 octane and the other half with 89 octane and this will give you an equivalent of 87 octane plus it will save you money because the lower octane gas costs less.