We've recently had the 310 (basically the same)
CUPRA Leon Estate in for
review and with 1300 miles on the clock I did get 40mpg out of it but it doing A road driving at around 50mph but didn't last long after, town driving was around 26mpg and on a normal drive to work (A road, motorway and town driving) mid 30's I'd say but the longer you bed in the better it will get. Unfortunately I didn't look at the Mpg after a spirited drive lol