I'm interested to know if your next results were any better.
I have the same ongoing complaint with my '07 Seat Altea 1.9Tdi (105ps engine) which averages 45-47 mpg on my mainly motorway 35 miles each way daily journey. I've just done 22,000 miles in 15 months. Dealer said it will improve once 'bedded in'. But no change.
This follows my 2 previous Seat Toledo 1.9TDi's - old technology engines - but which did 57 mpg ! Interesting that Seat posted 61.4 mpg for urban cycle for both old & new engines - and insist that these stats are fair.
How can they be, when the result is an extra £300 fuel cost p.a. ?
First time on this site, as the old Seat / Skoda one was closed down due to hackers. But looking forward to views of others with same engine/problems.