My bike feels like it loves going 70-90 mph! My passing power at those speeds isn't as great as a modern bike, but fast enough to surprise me half of the time. I've left a few other bikes in the dust, and I don't think a single car has ever challenged me and won, other than some kids (and I use that term sparingly. Being 20, there aren't too many people younger than me XD) in a convertible Mustang going well over 100 mph on the interstate. Though needless to say, within a mile of them passing me, I see them on the shoulder, with a state trooper stepping out of his car hehe.
I hate interstate riding for long distances, and hell I hate it for short distances too, but I can at least try to make it fun if I'm doing a 50 mile jaunt or something. Tomorrow and the next day I have to go to Orlando for work, which is a 100 mile round trip on the interstate...and in rush hour traffic no doubt. I'm going to get frustrated, but I'm going to find plenty of opportunity to have fun. The engine just seems so "alive" at the higher speeds. It's loud, and it's "screaming" but doesn't nearly sound like it's struggling.