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Gas prices are up one month and then down the next, but don't let that sway you. It's always a good idea to maximize your fuel economy regardless of market prices because there is so much more at stake than just money. Improving your miles per gallon reduces dependence on foreign oil and limits your CO2 emissions; pretty compelling reasons to put these simple tips into action.

It's a safe bet that you have already been advised to keep your car in good repair. If you've never changed your oil, your brakes are dragging and you have more junk stored in your car than in your garage, chances are these ideas won't help much. Attend to those issues first.

If you've been reasonably good about vehicle maintenance, then I think you'll find these tips easy to implement. And best of all, they cost nothing.

Read through to the end and I'll explain how these ideas improved my own personal vehicles' fuel efficiency.

AIR UP THE TIRES
I know, I know, you've heard this one ad nauseum. Usually this advice is accompanied by the disclaimer that you should make sure to not exceed the vehicle's tire pressure recommendation often found around the driver's door area. Well, I'm saying to boost it higher than that. You'll get a rougher ride and less cornering ability, but in return you will lower the tires' rolling resistance, aiding fuel economy in the process. When GM created the Chevrolet Cobalt XFE model with class-leading fuel economy, one of the first changes they made was to throw on some low-rolling resistance tires. This is your own personal DIY version.

Whatever you do, though, don't exceed the maximum pressure molded on the tire's sidewall. Midway between vehicle-designated pressure and the tire sidewall maximum pressure is a good rule of thumb.

And remember, for accurate readings you need to check the pressure when the tires are cold. That means the vehicle has been sitting - preferably out of the sun - for at least three hours.

LOWER WIND RESISTANCE
This one is key for higher speeds, such as long trips on the freeway. Get rid of the cargo box on the roof rack. In fact, get rid of the crossbars on the roof rack. If you have any bug deflectors, Christmas ornaments or any other add-ons that block clean airflow, get rid of them.

Lowering wind resistance also means reducing you speed, especially if you drive a high-profile vehicle like a minivan or SUV. The majority of engine output goes to fighting through the wind when you are traveling at highway speeds. The higher the speed, the more

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