The consensus is regular 87 octane but for the sake of discussion I will
share what the late Bob Donalds suggested when I inquired with him once.
For cooler weather and light loads 87 octane and fully loaded trips in
hot(Summer) weather Premium which around here is 91 octane.  I do not have
enough knowledge on the subject to declare either way, just sharing what Bob
recommended.  I do know that the baseline gasoline is the same no matter
what name is on the sign and that it is the additive package that makes it
different.

Mark in AK

On Thu, Jun 17, 2010 at 10:03 AM, Loren Busch <starwagen@gmail.com> wrote:

> So while we are talking about additives like Techron, what gas are you
> burning in your stock WBXs?  Regular, Mid Grade, or Premium? Ignore brand
> names please.
>