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Cars and trucks can benefit greatly from clean air filters. Many drivers are aware of the need to change the oil in their vehicles according to the intervals designated in their owners’ manuals, but few may be aware of the many benefits of changing air filters. One such benefit pertains to fuel efficiency. The automotive website CarsDirect.com notes that studies have shown that changing clogged air filters can improve fuel efficiency by as much as 10 percent and save drivers as much as 15 cents per gallon of fuel. Clean air filters also can benefit the environment. When vehicle air filters are clogged, air flow to the engine is reduced, adversely affecting vehicle emissions. Clean filters increase air flow to the engine, reducing vehicle emissions as a result. Clean air filters also can help drivers get more out of their vehicle investments. Designed to trap dirt and debris, clean air filters prolong engine life by preventing such particles from damaging engine components. Drivers can check their owners’ manuals for air filter replacement guidelines, but manufacturers generally advise drivers change their air filters every 12,000 to 15,000 miles. Such a repair is inexpensive but can go a long way toward ensuring vehicles operate as efficiently as possible.