Well, I just bought 4.10 gears for my stang but I don't use it as a daily driver so I see where your coming from. IMHO I've heard of mustangs getting decent gas mileage but usually it's because of having the 2.73's and nothing larger. If I drove that distance to work every day in my stang, I definitely would stay with 2.73's but thats me. You know even 3.55s will still hurt the gas bill pretty good so hope you have lots of gas money, you will need it for sure if you change. Anyways, good luck.
James
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90' Mustang GT Convertible-
C4 w/ manual body
4.10's soon to be 3.27's
2 Ch Flowmasters
1/8th ET 9.04
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