Based on the info available at
seat.com about DQ381and info found in an older Leon
brochure about DQ250 ratios, I put together the following table:
It shows that gears I-III are very close (with DQ381 being just a little bit shorter) and gears IV-VI are identical. I was quite surprised by that, I was expecting DQ381 to be shorter for gears I-VI, with VII being a little above VI from DQ250...
The speed for 7th gear 1000rpm is 55.9/1.609=34.7 mph, which is in line with the value given two posts above.