Hello everyone, new to this site so I hope I have the right section....

I took delivery of my new A6 Avant 2.0 TDi S Line on Saturday. A few problems were immediately apparent;

1. A noise from the near side rear suspension when going over a bump (doesn't happen on offside)
2. A constant metal whirring noise at speeds over 50 mph (didn't do that in test car), car feels sluggish.
3. I've covered 300 miles so far (careful dual carriageway driving 50-60 mph, constant speed) but only getting 37 mpg!

My Audi dealer seems disinterested, telling me this is normal, problems will go away on their own. Does anyone else have this experience or can offer any useful advice or comments?
Many thanks,

Mark.