I suggest you move here and buy a Model S.
Surely you jest. This is circumstantial at best.
The maintenance costs don't get interesting until the Audi is out of warranty in 4 years - I am confident Audi will have no advantage in this area.
Audi Care on an S6 is around $880 I believe. That takes care of maintenance up to 45,000 miles. 50k miles on a Model S is $2400 if you pay each year, or like $1600 (if my memory serves right) if you pay in advance. Still around double at the minimum.
We don't know Model S maintenance costs above 50k, but the S6 from 45k until 75k is $1200 with Audi care. All in there you'd spend $2,080 on scheduled maintenance up to 75k miles and $2,400 on the S up to 50k (or $1600 if you prepay). The dirty, complicated gasser with all the moving parts and transmission comes out ahead.
The unknowns there, of course, are the S costs above 50k and the random items that aren't covered under the routine maintenance packages.
How can you not take gas into consideration? It is the most expensive part of owning a low mpg, premium guzzling performance car. Premium gasoline is well over $4 a gallon here, and any reasonable projection has it over $5 after your warranty is up.
The gasoline cost over 4 years is well over $10000.
As I said, I don't own an S6, but I get something like 22-25MPG on average in our A6 -- but yes, it does get costly to fill up. I threw in gas because that's the ONLY way in my mind the S comes out cheaper than the Audi -- though, your original post implied purchase cost.
I don't know...That S6 interior picture kind of makes me want an S6.
Yep, I love Audi interiors. That interior isn't more cluttered than many I've seen, and the most important buttons are all tied to muscle memory by now. The little 1 2 3 4 5 6 thing is a contextual touchpad with a backlight. In that mode it can choose a quick radio preset. Jump over to the nav map (also Google earth) and it turns into arrows for you to scroll the map with. This car is no tech slouch