I actually got better mileage in my 91 LX 5.0 5spd when I changed from 2:73's to 3:73's. Thats because I never really did any highway driving, and the gears let me get into 5th when driving around at 40-45mph. Where as before 5th gear was only good for 60+, a speed I was hardly ever at.
But for an auto, I don't think you should lose anymore then 1-2mpg around town, but definately a lot more if you do highway driving.
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'97 T-bird LX 4.6L 2V, auto
SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more
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