Y'all

>>I say "you" if it is one person, but "you guys" if it is more than one. I even say "you guys" if the group is all female.<<

Same here, where "you guys" definitely acts just a second person plural pronoun and nothing more in informal speech.

"You guys" is the norm here too. However, outside the city in the Ottawa Valley, "youse" is pretty common too; it's supposed to be due to Irish influence. This is very stigmatized though. "Youse guys" also occurs; it may be similar to "y'all" vs. "all y'all" as explained by Skippy.