I used about half a bottle of Seafoam this weekend. I poured a few ounces in the oil and let the engine idle for a few minutes and dumped the oil and changed the filter.
Then I added a few ounces to the tank and topped it off with 93 octane fuel.
I saw where the original poster mentioned several times that you can't have too much octane. I guess he has never heard of detonation.