Incredible wind noise and consumption – if only I had bought BMW

Have our V7oIII D5 automatic since June 2009 and during this time have covered 9000 km (total km now 27000). I was very surprised that the consumption is on average 9.5 liters, I do not get less than 8 liters even with extreme economy drive (max 120 on the highway, engine from at traffic lights, slowest acceleration, climate off). I am very disappointed, a review at Volvo did not bring anything. Furthermore one hears partly clear twisting snare e.g. when driving down a boron dsteins. Do you have that too? Having top experience with V70 II terrified of the poor quality and can only advise anyone to buy a BMW or other German premium brand is a really different level. Greeting Uli