No kidding. I have driven the car several thousand miles since I did my custom muffler delete and have averaged a 2-3mpg gain in fuel economy. Maybe this is a rarity, or some voodoo magic, but it happened. I guess my stock exhaust was just that restrictive, but I am sharing because $30ish dollars for a muffler delete and the gain yielded was well worth the money to me. I can take pics and add how/what I used from AutoZone to accomplish the muffler delete, which required no welding if anyone is interested. My only other performance engine mod is a Spectre CAI, which has been on the car almost since I first bought it nearly a year ago. There is not a tune in the car, yet.