Well...I've got 6 gallons in the tank and while my mileage won't be as good as yours, I routinely go 200 miles between fuel stops and that's mixed driving. Since the RK has a touring bike suspension, expressway isn't a comfort or speed problem, just a scenic problem from my point of view. Besides, I wouldn't go on the trip just for the speed, I have plenty of time and do that locally. Keep me in the loop anyway. I haven't ruled this one out.