High Altitude???

[Powells@ezlink.com]

Friends, since I arrived in Fort Collins, CO (just north of denver) I 
have noticed that the boost in our 1990 200 rarely goes above an 
indicated 1.1 bar.  On occasion I can get the normal 1.3 to 1.4 bar, 
but not dependably.

I found that gas up here is 91/87/85 (premium/plus/regular) octane, 
as opposed to the 93/98/87 which I found in Texas.  I also found 
that my wife had been filling up at a Sinclair station.  I wondered if 
the Sinclair gas's octane might be too low, causing the engine to 
knock and timing to be retarded, causing in turn a lack of boost...

I tried filling up on premium at a Texaco station (posted as the 
same octane, 91) and the situation has not improved.

Any thoughts on the possible cause?  I can certainly check timing, 
etc., but thought I would ask for group wisdon.

PS:  YES, I have thoroughly checked the intercooler hose, and it 
has no cracks or failures in the area where the oil collects.  BTDT 
already a few months ago.

TIA for any (constructive) thoughts).  Also FYI - my Audi page and 
Audi FAQ pages should re-appear within a week.
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Al Powell
Powells@EZlink.com
1958 Fiat 1200 Spyder "Transformabile"
1983 Datsun 280ZXT
1990 Audi 200
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