[mtbroadhurst]

Typically, I retard the timing in hot weather just a bit. It doesn't knock under normal conditions -- only when I am advancing up a steep hill in 2nd gear. And that's only for a few seconds.

As an aside, when last I changed the plugs (about 100 miles ago after a 20K interval), they were in tip-top condition. No glazing or oily deposits or anything. I probably could've reused them but, for the price of three new plugs, why bother?

But, again, my main question is: what are the performance-enhancing effects of advancing the timing? Better mileage? Improved power? Decreased emissions? Anything else?

Thanks!
Mike