I am getting pretty good life on mine as well but oddly enough I get worse life with wifi on
Perhaps it's because I've been home sick and mostly on wifi, here are my stats.
I'm still gonna need 3 batteries with this phone. Maybe I won't need a double capacity zpare, 'though. If you use the phone a lot, it still drains the battery fairly quickly. When I travel and don't have access to a charger, I'm sure I will need that 3rd battery some days.