They're somewhat rare; I think lots of people are keeping them who will sell once the 5th gen comes out. I'd take whatever you can find (even with lots of miles on it) unless you have money to waste on someone who wants too much for it.
When I was thinking about getting one, I looked around and people commonly report 27mpg for the 3.8. If it's the older 4thgen with the 3.4, I'm not sure. That 3.8 is pretty efficient, a decent piece of technology.
I know I'd get 35mpg, but I'm crazy.