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... record levels, fuel purchases still take a painful bite out of the family budget. Myths and legends tend to pop up anytime a subject is popular. Schemes for increasing gas mileage can be found all over. Let's take a look at some of the myths about saving fuel.

Myth One: Replace your air filter

Many people swear that replacing their air filter regularly results in increasing gas mileage. A clean air filter is supposed to supply your engine with cleaner air filled with more oxygen, increasing your engine's efficiency. Engines running more efficiently need less fuel to provide more power. This might be true if you drive an older vehicle (say 1980s or earlier). However, today's vehicles are filled with sensors and computer chips. As your air filter begins to collect dirt, your engine senses the amount of oxygen available and sets your air-fuel mixture to compensate. So, assuming your sensors are operating correctly, changing your air filter is likely to have no effect. Myth busted.

Myth Two: Over-inflate your tires

A popular proposition for increasing gas mileage is to pump up your tires. By increasing the pressure in your tires, you are decreasing the amount of the tire that's in contact with the road's surface. This shrinks friction and rolling resistance, so you need less horsepower to push the car along the highway. Although the idea makes sense, lab and road testing at edmunds.com found no measurable difference. It's a good idea to inflate to recommended levels, but anything beyond that is ineffective, and maybe even unsafe. Myth busted.




Myth Three: Switch off the air conditioner

Did you ever have to endure a ride without air conditioning just to "save gas?" The air conditioner is powered by your engine, so it's reasonable that there might be some savings to be realized. When the air conditioner is on, the compressor will be placing a small amount of drag on the engine. Turning off the air might be fine if you can leave the windows up without risking heat exhaustion. And as soon as you lower your windows, you'll be producing aerodynamic drag. So any savings you gained by enduring the heat will be lost by the additional power needed overcome drag. Myth busted.

If these ideas don't work, what will lead to increasing gas mileage? Driving habits. Staying at or below the speed limit and avoiding hard stops and quick starts will help you save fuel. In the long run, it will increase the life of your car, too.

Copyright 2005 - Kars Leasing, LLC, 3817 16th Street, Moline, IL  61265