c1apton- Yes you're right, ~2800 rpm @ 65 mph, and plenty of revs to spare. On those few occasions when I've been able to do a sustained 4000+ revs in top gear on the highway (in other words, haulin') I really get the sense that this is what the car was engineered for. Obviously other manufacturers engineer their products differently.
xsperf- Good rule of thumb (or foot).