I have had a 03 A6 2.7 Quattro S-Line and now have a 06 3.2 Quattro A6 S-Line, both great! Not cheap, about 51,000 this time and apx 48,000 for the 03. Lots of power, lots of room and luggage space, good handling for 4,000lb+ car, Great trip car we go to Atlanta from here in South FL lots and have driven to Texas and New Orleans as well and you don't get tired or Passed
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Due to present conditions we will most likely not get an Audi this time (We Lease) tjhough we wanted a A4 or A3. Going with something with better mileage and less cost for now.
I have Nothing bad to say about the two A6's we've had (except gas mileage not wonderful, but we have heavy right feet and the tickets to prove it!