For those who don't travel the beaten path, you could go wrong by being forced to buy 87 because there is nothing else available. And where I'm apt to ride, that's a regular occurrence.When you get back from that trip get the timing wheel and a new gasket for the cover. My wrist can turn further if I want more fuel but the only way to affect the timing at the low end is the wheel. Averages about 4 ft-lb and 4 HP at peak at the rear wheel. For a $162 total cost how could you go wrong?
My bike has knocked horrendously on 87 in the past. I was riding two up and at high rpms while making a pass on a two lane road. It wasn't particularly hot out. With that knowledge, I tend to ride much more conservatively when I'm force to buy regular. But as I said, that happens with some regularity. As close to the edge of knocking as it is out of the box, I'm not inclined to sacrifice its tourability for a little extra power. Especially given that I could easily get those power gains, by decreasing my beer and taco consumption...