I'm working on my rally route. Riding from central Indiana. On my smaller bikes, I try to stick to US highways and below. When I road out to the rally last year (~600 miles) I stayed off the interstates as much as possible. On the way home, I was on them almost exclusively because of time. Since I was crossing the Appalachians, the scenery was nice either way. Not sure so much when crossing the great plains. You guys who do the long distance thing, what do you use?