Hi, welcome to the club!=
At 20K miles I would expect it to have "run in" by now. Ours has 8K on it now, I can get 50+Mpg if I drive it as gently as possible, mid 40's around town with occasional run is about our Avg & low 40's with the Mrs driving it.
My only advice would be try gentle driving anticipaing road conditions etc... no hard accels and change gear @ around 2K revs.
2010 Titanium 2.0 TDCI Panther Black.