Hi,
Went to Italy and back (to the Netherlands), three years ago, on a CB72, yes that's 250 cc.
A CB72 is a more balanced bike then the CB77, and vibrates less. No fuel economics here, at 70 miles an hour it's doing 55 miles a gallon (if my calculations are good). I had my seat refurbished before the trip, and some "touring grips" on the (low) handle bar.
A year later I took the CB400F for the same trip, much faster, but just as reliable, like the CB72, only some issue's with the contact breakers once in a while.
Jensen