Bought a RR with the V6 last year.
Great engine, better then any V8 I had before (and I have owned almost all V8's Land Rover ever made through the years).
Fuel consumption, very good, or at least for a Land Rover. Average, easy to get 19-20 MPG. Long distance, 27 or even 29 MPG is possible.
Reliability ? don't know yet but no problems in the first 10 K miles.