Re: octane

[BRIT4VWS@aol.com]

The label on your fuel flap refers to the ros/ron or Research Octane Number
which is not the number that is indicated on pumps in the U.S.  The number on
the pumps in the U.S. is known as AKI or Anti Knock Index rating or CLC
Coastal Living Council rating.  this rating adds the two methods RON and MON
or Motor Octane Number and then divides it by two to get an average.  91 RON =
87 AKI and 93 RON = 91 AKI and 95-98 RON = 93 AKI the highest avail in the
states.  This is funny because the highest octane fuel avail. where I live is
91.  This is because of the altitude they can lower the octane in the gas
without having detonation do to less dense air.  I only have to put 85 AKI in
my car due to the altitude.  You can use this to your advantage if you don't
have a Knock Sensing engine by advancing your timing to compensate for the
altitude difference.  If you have a Knock Sensing engine (all Audi engines
after 88 are Knock Sensing) then the best thing you could do is put the
highest octane fuel avail in your car so you get the most performance out of
it as possible.  If you would like to know more E-mail me and we can talk
about octane some more.  Regular gas should be just fine in your car it just
might hurt it's performance if it is a post 87 car.

Brit
87 4000CS quattro