Around 100 mph, not by accident. Long drive home from Dealer, gotta vary the RPM on break-in you know. Felt very solid, since then have come close to that passing, etc. - very good pickup at high speed. I am very impressed the more I drive this car.
I was heading from Colorado down into New Mexico - wide open straight-line roads certainly help. I had mine up to around 116-119 mph. Very solid ride. Crisp, responsive steering. Would do it again in a heartbeat if the opportunity presented itself.
Based on that Car & Driver comparison between the 2.0L Mazda3 and the Focus, it looks like this new 3 may not have a computer-limited top speed. At least, their 3i GT was listed as having a drag-limited top speed of 131mph. Now I'm curious to know just how fast the 3s GT will go. 140mph, maybe? I won't be testing that guess any time soon.