I switched from 2.73 to 3.55 with little to no real difference in MPG. Of course, I don't drive my Mustang enough to really make a difference for me. It's just a fun car for the weekends, nice days, and the track.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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