I don't know how people could possibly drive 900+ miles in a Prius. If that's true, I'm envious. But I consistantly get about 850 kilometers per tank in my 2004. The best distance I've been able to drive was from Jasper, Alberta to Vancouver, British Columbia up and down mountain passes in the winter on one tank of gas. The trip was just shy of about 900kms.

As for speed, I typically drive at about +/- 5km/hr of the posted speed limit. I've pushed it out on the highway to see how fast it would go, and had no trouble get up to about 155km/hr which is a little over 90mph. It didn't even take much effort to get up to that speed.