>Had no idea a Prius would go that fast! ...
Indeed, 100 miles/h would be about 160 km/h. I start feeling uncomfortable when I am at around half this speed (i.e., 1/4 the potential energy!). But then, of course, our highways here are probably not so convenient for speeding.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)