High altitude, and low octane

John Shost j_shost at excite.com
Fri Jun 1 19:19:26 EDT 2001

Anti-knock reductions by geographic area & month are given in ASTM D 4814.
(max is 3 & 1) You pay for what you get, want more - pay more (can't jack
the TV ratings with news like that) If your Audi has knock sensors you can
probably check (with VAG-COM) the amount of knock & ignition retard you are
getting to see how you stand. Here is a check I made: 


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