In regards to what's "fast" is all a matter of opinion to a degree. I don't think you need to do a certain speed in order to ascertain what might be fast. I've driven up to 130 mph on a private road and that was fast for me. Perhaps for F1 drivers that's pedestrian. I think any car that has a 0 - 62 speed of 6 seconds can be considered a quick car, but again that's just my opinion. Compare the Glanza which is supposed to be a "6 second car" that's a 1.3 turbo and as light as a fart, the 350z as we all know has a considerably larger engine and weighs a lot more that a fart, perhaps a turd. Either way I think a standard Glanza would probably give a zed a good run for its money in a straight line and definitely round the bends. Maybe in that respect the Zed is not all that quick as you might expect more from a thumping 3.5 V6. They are both quick cars for very different reasons.