Interestingly I am different. I use a wide grip and I unconsciously tuck my elbows in. When I use a close grip, I sometimes unconsciously tuck my elbows out. While others (like above posters) may experience the exact opposite. It may be due to lifting habit, physical structure etc.
I think that the most painless, comfortable, and strongest (this is debatable) grip is one's personal ideal grip. This may be a process that takes months, and many sessions of tweaking here and there. Then again, one may feel that this is starting to get too unnecessarily technical, to use months to find an ideal grip. So it all depends on the individual. Some people settle down to a grip quite decisively. Powerlifter Konstantin Konstantinov appears to be 6'3 and he uses quite the close grip.