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C■ Metro service ars 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

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