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I know when it's time to clean the air filter on mine, the gas mileage drops...dramatically. If I start averaging less than 25mpg I know it's time to clean the filter.
__________________ Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming ...."WOW! What a ride!!!!!"