7. Tighten the Fuel Cap

10 Ways to Save on Gas

This tip might sound like a no-brainer… but many of us are preoccupied while at the gas station. Next time you pump, make sure your fuel cap is screwed on tightly to prevent gas evaporation. Don’t let your money float away.

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10. Don’t Idle Some experts suggest that if you’re making a stop that will last longer than 60 seconds, you should turn off your engine. The jury is still out on this one, but many say that it takes a set amount of fuel to start your engine while it takes a greater amount of fuel to keep it running over an extended period of time. So if your friend is getting out to use the ATM or grab a Coke from the convenience store, turn the car off. (AP Photo/Mary Ann Chastain)
9. Turn the Musi... This may sound strange, but think about it: It is rare to speed and not have a great song blasting to help you race through the streets. If you’re looking to get to your destination in one piece -- and save money on gas along the way -- turn your music down. It will help you concentrate, drive steadily and conserve whatever is left in your tank.
8. Buy Gas Late ... Fuel, like many substances, can be more or less dense depending on its temperature. On a hot summer afternoon, gas will likely be less dense. Try filling up in the early morning or late evening when gas is likely to have a higher density, providing more bang for your buck. On the coldest days of the year, when fuel is of highest density, you'll get the best value.
7. Tighten the F... This tip might sound like a no-brainer… but many of us are preoccupied while at the gas station. Next time you pump, make sure your fuel cap is screwed on tightly to prevent gas evaporation. Don’t let your money float away.
6. Combine Trips Do you really need that pint of ice cream today? Is the dry cleaner you use near your job? These are the kinds of things you should consider before picking up your car keys and heading out the door. If you can combine all of your errands in a single trip, you'll eliminate starts and stops, and save fuel in the process.

And be sure to always go to your farthest destination first. This tactic should reduce the total distance you travel, which means you'll use less gas.
5. Shop Around Sites like GasBuddy.com and GasPriceWatch.com allow you to check local gas prices before you leave the house. The age-old way of driving around until you find the cheapest isn’t efficient, and actually wastes even more gas. Shop around in advance to find a happy price point, then fill’er up.
4. Carpool Going to work? Going to play? Do it with friends. Piling into a vehicle with three friends cuts your cumulative gas costs by 75 percent. Whether you’re going to work or just going to dinner, consider the extra savings if you and a few neighbors go together and split the travel costs.
3. Perform Routi... You’d be surprised what a tightened belt here and there can do. Your car's routine, factory-scheduled maintenance checks improve the way it performs overall, including its fuel efficiency. Have your car serviced at regular intervals -- and don't ignore any dashboard warning lights that come on in between.
2. Limit Air-Con... It should come as no surprise that your air-conditioning system could be a gas-guzzler. On those cool and breezy days, put the windows down or open the sunroof. Let the wind in and push your fuel costs down.

To be sure, several factors should be considered when evaluating the toll that air conditioning may take on your gas. However, it won't hurt to err on the side of caution when you can comfortably keep the windows down -- especially if it's a beautiful day.
1. Lose Weight The ugly truth: Your car runs better when there are fewer forces working against it. Wind, precipitation and extra weight are all factors that drain your gas tank. Getting rid of your bike rack, spare bowling balls and golf bag will cut the down the strain on your vehicle. And although this may be the hardest to achieve, shedding a few pounds will certainly make you and your car run more efficiently and economically.