The 4 cylinder 5 speed cars can get around 40mpg, while the V6 5 speeds get around 30. A V6 automatic like mine gets around 25. They're reliable if they are taken care off, mine wasn't and things are constantly breaking on it. But then I know of people that have had no trouble.
There's a forum that I am a member of that has over 10,000 members. They have all the info you could ever want.
http://www.fiero.nl/forum Everyone there is really helpful.