I've had mine 15 months. Around the doors is anywhere between 22 and 34mpg according to the computer.
On a clear run from work, 17mi down the A1 from Northumberland to Gateshead, I can get up to 55mpg. Best I've gotten is on a run to Cambridge at 58mpg.
Performance wise it's ok. I don't tend to race people anymore like I used to so don't feel embarrassed performance wise like I maybe once would have.
I've mastered the art of knocking the gearbox into sport mode for quick getaways from junctions though as drive can take a while to decide what it's doing. That said, fuelling it every two weeks is making me look forward an EV next. Have been looking at the BMW it through salary sacrifice but still got just under two years to go.
I can honestly say I don't miss the 190PS TDI A4 I had previously, especially as this version handles better and has a nicer interior (VC and B&O).