Before I moved to Tennessee, I used to say "you". However, after living in Tennessee a short while, I adopted y'all for small groups and all y'all for large ones. After moving back to Iowa, I'm not sure y'all will totally leave my vocabulary. Likewise with yonder and reckon. I'm also more likely to address ladies and gentlemen as "Ma'am" and "Sir". My wife slaps me upside the head for saying, "Yes'm" to her, though.