That's normal for the 6 speed, especially from a cold start. Low 20s (sometimes teens) in the city, mid 30s at motorway speeds. Mine regularly averages 7-10mpg more on the return journey though once it's all warm, it takes a fairly long time for it to fully warm up.I never get much more than 35, even on longer runs. I might get 37-39 if i reset the trip when i join the motorway and drive like a granny with added spidey-senses!
I had mine show 52 once after 15 miles in a 50mph average zone, starting with a warm engine/gearbox from some services.