I found this on the net while doing a little bit of research and figured I would share it with you all.
Top Speed Calculator
And since I'm feeling very generous, here are the 2011 gear ratios for both manual and auto (from the Ford spec sheet - I can email it to you if you need it).
Final drive 3.31:1
Final drive 3.15:1
And stock tire sizes....
Standard P235/50ZR18 A/S Pirelli PZero Nero
18 x 8.0-inch wide spoke painted aluminum wheels
Standard aluminum wheel mini-spare
Optional P235/50ZR18 A/S Pirelli PZero Nero with:
18 x 8.0-inch premium painted aluminum wheels
P245/45ZR19 A/S Pirelli PZero Nero with:
19 x 8.5-inch machined face with painted spoke aluminum wheels
18 x 8.0-inch sterling gray metallic painted aluminum wheels (MCA Edition)
19 x 8.5-inch machined face with argent painted aluminum wheels (GT/CS)
255/40R19 Pirelli PZero Summer-Only (Coupe)
P255/40ZR19 Goodyear F1 Supercar (Convertible) with:
19 x 9.0-inch dark-stainless premium painted aluminum wheels
(Brembo Brake Package)