I needed to know what to do about my problem.I purchased a corsa sport tuned exhaust system for my 2010 silverado.I had it installed, drove the truck and noticed my fuel mileage going down. I was getting 500 miles on a tank of fuel but now only 440, can some one help shed some light on me. The truck has a 5.3L and no driving changes have been made just low and slow, I don't get it. Help please!
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