2000 Audi S4

[Briansol]

yeah, e85 isn't widespread. I've YET to see a pump in my life. Doesn't exist in new england area.

So, take that into consideration if you ever plan to travel with the car.

 

[E_SolSi]

http://www.ethanolretailer.com/flex-fuel-station-finder

 

[B16]

Do what I did and have two maps available at any time. If I went to an area without E85 I could switch to a 91 octane map and use regular gas until I got back to a place with E85. You have to be empty on E85 to go to 91 and in the case of my car I had to drain any 91 out before filling with E85 and switching back to that map.