I got my new Flowmaster Series 10 dual exhausts put onto my 2012 Chevy Silverado 1500 LTZ back in August. I love them, sounds great, however, my fuel economy has dropped big time. I used to get 400 miles roughly on a tank now I’m barely doing 200. Help please help! All the dealers says there’s nothing wrong with it. Internet says exhausts don’t effect fuel economy. I do have over sized tires but they are accounted for in the original fuel mileage. Any reasons or possible solutions to try?
