About a year ago I asked a similar question: http://forums.pelicanparts.com/911-930-turbo-super-charging-forum/904789-octane.html
After more research I decided I would be ok with the 90 octane as long as I wasn't racing or going for high boost numbers. I have twin plugs,cis and keep it on the rich side. 
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Steve
1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters.
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