Focus Fanatics - View Single Post - What have you done to increase MPG?
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Old 12-25-2011, 10:19 AM   #41
piranha971
Focus Rookie
 
Join Date: Sep 2011
Fan#: 90342
Location: MOUNT PROSPECT, IL
What I Drive: 2012 Race Red SE Sport 5sp

Posts: 18
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Here is what NOT to do if you are looking to improve fuel economy: get rid of the rear muffler.
Leave it alone. Its there to create back pressure and improve fuel economy and doesn't do much muffling. I would say replacing just the rear muffler with a straight through Borla cost me 2mpg with no noticeable difference in performance. The car sounds right, though. I just could not stand the total silence of the stock exhaust..... And that ugly pipe in the back.
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