What do you guys feel is a safe rpm to cruise at on the highway for a long trip? Like 10 hours on the road? My car is at 3200rpm@65 mph. Will I be fine going 65mph all the way? Thanks

as long as your equipment is in good shape it should be fine. i've take trips up to 500 miles.
i also turn 3200-3500 rpm.
it may keep you from speeding http://www.chevelles.com/forum/smile.gif
you'll get to give it a rest often.as per 12 mpg!