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Clean your air filter:

The Car Care Council of America says replacing a dirty air filter with a clean one can increase gas mileage by 2 miles per gallon. A dirty, clogged air filter makes a car's engine work harder, decreasing fuel efficiency.

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Ditch the roof rack:

According to Consumer Reports, carrying anything on top of your car, including an empty roof rack, decreases gas mileage. That's because at highway speeds, more than half of an engine's power goes to overcoming aerodynamic drag. When Consumer Reports put a large car-top carrier on a Camry, the car's gas mileage dropped from 35 mpg to 29 at 65 miles per hour.

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Use cruise control:

A recent study by Edmunds.com showed that regular use of cruise control could save an average of 7 percent and as much 14 percent in gas costs.

While it's not realistic to drive 55 mph on Tennessee's 70 mph highways, it is possible to raise your right foot just a little. Edmunds.com showed an average savings of 12 percent for drivers who dropped from 75 mph to 65 mph. And the savings could be even more significant on a long trip.

Check that gas cap:

According to the Car Care Council, a loose gas cap allows gas to evaporate, which can lead to losing two miles for every gallon of gas. So after every fill up, be sure to give that cap one final turn.

While it's not realistic to drive 55 mph on Tennessee's 70 mph highways, it is possible to raise your right foot just a little. Edmunds.com showed an average savings of 12 percent for drivers who dropped from 75 mph to 65 mph. And the savings could be even more significant on a long trip.

Avoid idling:

If you're going to be stopped for more than a minute, turn off the car. Not idling can save as much as 19 percent, according to Edmunds.com, which should be plenty of incentive to skip the drive-through lanes.

Just park it:

Park in the first space you see. Driving around looking for a closer space wastes gas unnecessarily, so park as soon as you find an open space.

Don't top off:

When you buy gas, don't top off. Adding a bit more gas once the pump has stopped not only contributes to ozone pollution, but also increases the risk of gas sloshing out, which is like throwing money away.

Use air conditioning wisely:

Make the most of the air—and air conditioning. While air-conditioning burns gas, many experts believe it's more fuel efficient to use air conditioning at speeds over 45 mph compared to keeping the windows rolled down, which causes wind drag. When driving in stop-and-go traffic and at non-highway speeds, it’s more fuel efficient to keep the windows open and let the breeze help keep you cool.

Don't drive aggressively:

A gas conservation study conducted by Edmunds.com found that you could save an average of 31 percent and as much as 37 percent by chilling out.

Accelerate slowly:

Gas is consumed more quickly during hard acceleration, so you’ll improve your mileage by easing up to speed rather than jamming the accelerator when a light turns green. And conversely, let up on the gas a few blocks before you reach a red light and it may be green by the time you get there.

Empty your trunk:

If your trunk is full of junk, clear it out. Extra weight in the trunk makes a car less fuel-efficient, especially on inclines.

Check tire pressure :

Proper tire inflation can increase fuel efficiency by about 3% according to the U.S. Department of Energy. Check your tires (or your owner’s manual) for the recommended tire pressure and then use a gauge to hit that number. Conduct checks monthly, especially in very hot or very cold weather.

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ET has the latest...

Former Blink-182 drummer Travis Barker and celebrity disc jockey DJ AM are expected to make a full recovery following the Learjet crash in South Carolina that critically injured both men and killed four others. 

Dr. Fred Mullins, medical director of the Joseph M. Still Burn Center in Augusta, Georgia, said the two are being treated for second- and third-degree burns but are otherwise healthy and therfore should make "a full recovery."

Barker, 32, and 35-year-old DJ AM, whose real name is Adam Goldstein, remain in critical but stable condition. "Since both Barker and Goldstein are in overall good health and didn't suffer from any other crash-related complications, a full recovery is expected," Mullins said.

Barker's ex Shanna Moakler rushed to his side following the crash, People magazine reports. Barker's former mother-in-law, Gail Moakler, told the magazine, "We're totally crushed," but Shanna rushed to be with Barker after learning of the crash on Saturday morning.

Moakler, whose daughter Shanna was married to Barker from 2004 until earlier this year, said, "Our heart pours out. We're hoping he recovers. The family is rallying around him and saying our prayers." Shanna, 33, a former Playboy Playmate, has a daughter and a son with Barker.

In their personal blogs, Lindsay Lohan and best pal Samantha Ronson offered words of support for their friends. In a MySpace blog entry with the heading "horrible news," Lohan says: "Please send your prayers out to Adam Goldstein and Travis Barker - along with the others lost in the plane crash. It's so scary to think that life can end so fast...we must all treasure each and every moment - and be thankful for what we have."