rsfourtune

shell

MrBucket

Sunoco

Bob W.

Shell 90% of the time, Exxon the other 10%

McGyver

chevron

Miwa

I always stick with the companies listed at http://toptiergas.com/ (That URL is even in your RS4 manual)

1FASTCAR

Here in the corn country of Iowa all stations offer at least one grade of gas with 10% Ethanol. Shell has switched all three of their grades to 10% Ethanol. BP was the only brand in the area offering 93 octane without Ethanol, but about year ago they downgraded from 93 to 91 as their premium fuel at the vast majority of their stations. I only know of three locations around this area that are still selling 93 octane fuel that are Ethanol free. All three are out in the country and are further to drive to fill up, I feel it is worth the trouble and I can't complain about driving the RS4 or C32 a little longer.

sykotoy

Shell V-power Racing 100 oct (incl 5% eth) limited stations sell it

BlkJet

I find she runs best on 76. In BC where I grew up nothing but Chevron 94. When I go back to visit the RS4 LOVES that gas.

Mark'sTTSMMM

It's been BP thus far due to convenience, but I'm open to Mobil and Shell too.

RS4saloondrivr

Shell 90%, Mobil 10%