If the car runs it'll blow away 30 mpg period. I just purchased mine two days ago, and with it not running well I topped 60 mpg on the freeway home.
Other than that, I'd look this thread over. It goes over the common issues that you will have to deal with. Some are mechanical and the hybrid pack will need attention at some point. Nothing seems horrifically difficult if you're mechanically and a little electronically minded.
http://ecomodder.com/forum/showthrea...ems-18892.html