"Yeh, that's right, I'm the Egg Man
Driving Around, King of the town
Always got my windows rolled down
You know, I'm the Egg Man"
If the temp is around 70°F, or the sun is down and below 80°F, then sometimes. In heavier traffic, I prefer not to smell cigarette smoke (and I almost always do), so they often go right back up. Ick. Never when above 45 mph, there's too much of the "waffling" sound.
I do enjoy the fresh air, so it sucks that I'm so picky.