Ford Repair: horsepower, power adder, buld

Question
I have a 03 GT.What are the best gears I can get for it? Also what type of gas i should be using.

Answer
Jeremy-

  The best gears depend a lot of the transmission.  If you're using a manual transmission, 3.55 or 3.73 gears are probably best, especially if the car sees mostly street/highway driving.  For an automatic car 3.73s or 4.10s are more the way to go.  As far as gas goes, it's not going make a huge difference on a car that's mostly stock or even fairly well modified.  Unless you're using some sort of power adder or a high compression ratio.  In my truck I use mid-grade gas which is (where I live) 89 octane.  It seems to be a good mix of protection against detonation and lack of build up causing extra octane.  Remember...premium gas (usually 91-93 octane) will cause carbon buld-up if your engine doesn't need it because the fuel doesn't have a chance to burn off completely.  Hope this helps.

Steve