Well I have no experience with the Honda Fit, however, my mom has a Pontiac Vibe in a bright red, and it get's about 30MPG...31 if I'm driving

and it is just about exactly like the Scion XA, and we love it. That's what I want to get when I'm ready for my own car. Happy shopping.
Oh, what about the newer Ford Focus? It says it get's 35MGP now, and it has that cool music thing.