I can't remember the last time I said howdy mate or g'day. I greet people (about 100 or so) each day on a friendly basis and I normally say, " hi, how's it going Mr Jones", " Hi Tom", "Hey David", "Morning Greg". People sometimes actually get offended by the use of the term "mate" if you're not their best friend. But then, I'm a female so blokes might be different!