I have been running Union 76 race gas. 100 Octane. The station near my house has it at the pump. The car seems to like it alot better than the 91 which is the only other premium pump option around here. The $8.50/gal is no fun though.....
Here are a few links to help locate higher octane fuel:
Various Race Fuels.....
http://www.ctracing.com/race_fuel.htm
Forum thread with long list of locations for race gas......
http://www.6speedonline.com/forums/9...as-so-cal.html
Sunoco 100 octane unleaded...
http://www.sunocoinc.com/Site/Consum...T100Locations/
Rockett Brand 100 unleaded (and other Leaded grades)...
http://www.rockettbrand.com/dealers/dealers.htm
Gas City 100 unleaded...
http://www.gascity.net/locations.htm