Converting from Tablet PC to MacBook

Alan Fleming in the UK has been using an HP tc1100 Tablet PC for some time but with the recent release of Apple’s Boot Camp for the MacBook he just couldn’t resist the urge to jump.  He is posting some infrequent observations about the switch but this quote caught my eye:

Still getting used to the Mac. Definitely getting there; I’ve got the base set of apps stabilised. It’s a little odd to come from close on 4 hours battery life on the Tablet PC down to 2.5 on the Mac though. Means I’m looking for power sockets much more regularly than before. Still got a few queries which I should ask in another post.

This is the first I have seen mentioned that the MacBook battery life is that low.  Has anybody with a MacBook noticed this?