Generally in the city you will stay the same or get slightly better say 1mpg more. On the highway you can loose 1-3mpg because of the higher rpms. So its up to you if you want to do it or not. It will make the car alot quicker out of the hole to me its worth it.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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