Audi has been on a roll these past couple of years with high-performance variants of its already impressive models, and the recent addition is the RS6 Avant GT. When Audi adds the GT moniker to a ...
That's more than $70,000 over the standard RS6 Avant Performance.
The result is that used values have slumped as original owners load up the used market with their cast-offs. So you can now ...