I have a A1 courtesy car while my A3 is lying at Highland Audi awaiting surgery that wasn't expected, (by them or me)...!
I do a 26 mile each way run to work daily and I'm getting 53.1mpg from a car with 16 miles on the clock when I picked it up. Not bad, but I did expect slightly better. I'm comparing it to my old BKD 140 TDI, which was nippy and frugal. The A1 is just not nippy enough yet to be majorly impressive and courtesy car or not, I'm treating it like I own it.
Maybe it'll loosen up as it racks up some more miles.
Not bad at all though, decent commuter and it handles like a limpet.