It has a battery saver mode, it helps.
Data wise, I've been playing it most of today and I've not used 10MB. But, if I really want a specific spot where I'm standing, I have to set my GPS to high accuracy, which is a battery killer. Power saver GPS works fairly well, not accurate enough to be standing AT a spot and for it to recognize you are there though, but works well enough to play. GPS only fails 100% of the time, won't even let you play the game.