Gnil, Just what trees in most of Wyoming, Kansas, Nebraska, Utah etc are you talking about?  There aren't many. You can hit some high numbers out there. Someone here used to commute 60 miles from ft Collins Colorado to Cheyenne Wyoming in 30 min or less.

As for going fast into blind corners on windy roads,  forget it. Having seen that done and watching a sheriff standing in the road at a accident scene almost get run over I wouldn't advise it.