At  9/17/2009 11:17 AM,Dave Mcneely wrote:
>Well, that sounds definitive.  I was hoping for a reply that would
>enlighten me a little more, however.  VW clearly recommends minimum
>octane 87.  Gasoline in the West is clearly lower octane than that (on
>reasonable theoretical, and I suppose data driven, grounds).  Numerous
>folks, including some with claimed technical expertise, state that the
>waterboxer is subject to detonation knock (ping) and that the octane
>value of the gasoline used is iffy in that regard.  Consequently these
>folks recommend higher octane gasoline.  If they are wrong, I'd like to
>know how we know that.  If they are right, I definitely don't want to
>waste my money.  I'd just like to understand it a little better.

Does yours ping? If so, run a tank or two of the premium and see if
the ping goes away. If the better gas helps then it's worth the money
& if it doesn't change then go back to the regular gas and look for
the (ping) problem.

Rob
becida@comcast.net