I put an Am . Muscle axle back on my 2012 gt and my mileage dropped 5 mpg

Asked by Lynnster Jun 25, 2013 at 10:22 PM about the 2012 Ford Mustang GT Convertible RWD

Question type: Car Customization

5 Answers
57,945

Tracy answered 10 years ago

That's a significant drop. It should have increased your performance and mileage (a little) if anything. Of course, this exhaust system has more to do with sound than it does performance.

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265

Rusty answered 10 years ago

If the mufflers are more of a straight pipe like the SLP then that could be the cause for the drop

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10

Jacob answered 10 years ago

If you didn't adjust the Auto or Manual (Transmission / Flywheel) with an Automatic Tuner (plug-in computer pad) then your vehicles WILL significantly suffer. It's not allowing the new parts to be utilized , instead it's using Original Manufacturer's Specifications.

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