i have 3.73's mileage is 23.4 mpg in town, highway 27 mpg my car has 200,000 miles all the stuff in my sig etc. i wish i would have went with 4.10's thats just me though.
Mods: The usual stuff... 3.73 Gears, J-mod, catless mandrel 2.5" true duals, Marauder Converter, Eibachs, Xcal2 and Phoenix Gold Audio, chrome 18's, etc. etc..
I joined the dark side...
2002 Mustang GT, FRPP Aluminator with Tork Tech MP112 intercooled S/C at 17PSI, with all the supporting mods.