I tried doing some math to figure this out.
Our cars have two final drive ratios. One is for 1st-4th gear, the other for 5th and 6th. I can't find anything that says which one reverse uses, though, so I'll do both:
*Manual Transmission*
Reverse gear ratio: 3.99
"Final I": 3.94
Total ratio: 15.7
Wheel RPM at redline (6800): 433
Speed at redline: 32 MPH*
"Final II": 3.09
Total ratio: 12.33
Wheel RPM at redline (6800): 552
Speed at redline: 41 MPH*
*DSG*
Reverse gear ratio: 3.99
"Final I": 4.06
Total ratio: 16.20
Wheel RPM at redline (6800): 420
Speed at redline: 31 MPH*
"Final II": 3.14
Total ratio: 12.53
Wheel RPM at redline (6800): 543
Speed at redline: 40 MPH*
*Assuming an approxiamte tire diamter of 25" (78.5" circumference)