I'm trying to make my mind up whether to change from my B7 A4 Avant 2.0tdi up to an A6 Avant 3.0 tdi Quattro. It would mean selling my A4 first and it's all a bit fruitless if there's not going to be a great deal of difference. On trips longer than an hour, the A4 with dog, wife and 6ft son in the back, feels a bit claustrophobic and the legroom isn't as good for rear passengers as I had hoped when I bought it. I haven't sat in an A6 yet as there are none around for sale near me, but ask if there's much difference in rear legroom and general comfort inside the cabin compared to the A4? Also, I use the A4 for supermarket trips and general town and b-road driving and wonder if the A6 would feel too big to drive and park for everyday use? (I can drive properly but still regularly have a few near misses with SUV's on B-roads!) Many thanks for any replies.