I'm getting 52mpg around the doors right now, typical commute:-
1 mile through North shields doing 30-40mph
straight onto the coast road, straight up to 80mph for 5 miles.
2 miles doing 30-40mph again
2 miles doing 60mph
2 miles doing 30-40mph.
Same commute in winter does about 48mpg.
Given that the official figs for my Scirocco are 53.7mpg, and 67.3mpg, I would expect to achieve at least 60mpg for my commute.
I easily achieve 56mpg on a run from North Shields to Hartlepool (30 miles on pretty much all dual carriageway at 80mph) right now, so in theory I should be able to beat the combined figure for the GTD, once the rings are properly seated (500-1000 miles tops).