Waves are also pretty common among bikers. I usually raise my hand slightly off the handle bar when I'm riding , both hands have to stay on the bar here in MI with all the damn pot holes and people using their cell phones or doing something else beside paying attention to their driving... Anyway, I don't know if you can call it a wave, its more like a polite recognition of a fellow rider.

Now when it comes to the XF, I only wave if I'm being waved at, unless its a female XF driver...Then I will be the first to wave...Haven't had too much luck so far...LOL.