I'm 6' 8" and I don't fit in the current Prius.

Two issues:

1. The track the seat is on is too short to allow me to move back from the dashboard far enough. Even at its limit, my knees continually rub the dashboard in the front. Besides being uncomfortable, it would not be safe under any accident scenario. This is especially unfortunate since there is still plenty of room behind the seat for a longer seat track.

2. Even if the seat could move back further, the steering wheel doesn't extend. In other words, even if you could move the seat back a bit further, you'd just be getting further and further from the steering wheel.

In the end, I actually fit better in the Honda Civic Hybrid... except for one issue there. They have the DUMBEST handbrake design that needlessly both a) doesn't recess all the a way and b) actually angles inward toward your legs. As a result, it painfully rubs against my knee the whole time.

As a result of all this, we don't yet own a hybrid. Initial reports are that the new Prius will be a bit bigger. It's supposed to be "revealed" in Jan. 09. We may wait to see that (or buy the Civic and modify the handbrake in some way).

Good luck.