While I do agree that setting the timing "by the book" doesn't necessarily get you the optimum setting, and I always advance mine as stated above, BUT (you knew that was coming didn't you) I would still use the light to get it "in the ballpark" as they say. It's going to save you a lot of time in the long run and maybe keep some of that $$$ gas in your tank instead of burning it up diddling with your dizzy!
