[excelguru]

If I use 100 octane, which way would that allow me to adjust the timing? Advance or retard? And how far in either direction? Is there something that I should listen for (or watch for) when adjusting it? Or do I simply have to make an adjustment & take a drive, adjust & drive, adjust & drive, etc. and just use my butt-o-meter to determine power gains/losses.

Glad to hear I caused no harm except to my wallet.

I didn't consider that the coolant could have pooled somewhere (duh). I'll check that.