Fuel grade in A6 4.2

[Louis-Alain Richard]

Almost all recent engines will tolerate lower octane fuel and adjust timing
accordingly.

However, especially if it is driven smoothly, you may tell your friend to
try a few tanks of premium because usually mileage is better, sometimes
enough to recover the higher price (here the difference in $ is about 6%).
If she drives like a maniac, then she'll only get too fast sooner so regular
is indeed a good idea :-)

Louis-Alain



-----Message d'origine-----
De : quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] De
la part de Eric Sanborn
Envoyé : 14 avril 2010 7:34
À : Quattro List
Objet : Fuel grade in A6 4.2

A friend and coworker of mine just got an A6 with the 4.2 engine. It is a
2000 model year. It calls for 91 octane. If he is willing to be a little
down on power can he use 89 mid grade? I seem to recall that it will just
retard timing. Is this correct?

Thanks
Eric