The 2001 Audi A8 runs on premium unleaded (required).
The 2001 Audi S8 runs on premium unleaded (required).
The 2001 Audi A4 runs on premium unleaded (required).
The 2001 Audi A6 runs on premium unleaded (required).
The 2001 Audi TT runs on premium unleaded (required).
The 2005 Audi A6 runs on regular unleaded.
The 2009 Audi A6 runs on regular unleaded.
The 2007 Audi A6 runs on regular unleaded.
The 2006 Audi A6 runs on regular unleaded.
The 2010 Audi A6 runs on regular unleaded.
The 2008 Audi A6 runs on regular unleaded.
The 2011 Audi A6 runs on regular unleaded.