I was talking to a friend of mine who has an FJ cruiser which gets pretty low mpg and he mentioned he bought one of these things http://www.scangauge.com/. Anyone ever use it? Looks pretty cool so I thought I would pass it on. Shows real time mpg and you can adjust your driving style to get better mpg. Not that I'm likely to do that but it also shows fault codes and lots of other useful info.