I'm almost always in the middle lane, sometimes the left lane if middle lane traffic isn't going fast enough. I avoid right lane because they're always doing ~10 mph under the limit and constantly having to speed up and slow down for on-ramps & off-ramps.
So I don't get accused of being a post ***** (ridiculous) I feel most comfortable in the middle lane. I feel it gives me the most options so that is where I live. I will switch to the left lane to pass if I get behind a slower vehicle then get right back in the middle lane. I do the same thing when I am a "cager" so I guess some habits are hard to break.