Hi there. With your weight, and wanting to do 65MPH for long stretches would seem to be putting a lot of stress on the bike. I'm sorry to say that I don't think this is the right bike for you. I reckon that you should be looking at least for a 500cc bike. 170 pounds and town riding is what this bike is designed for. Even for a lighter person, highway riding means the need for a bigger bike, plus, at 65MPH you haven't much left if you need to get out of the way of a truck in a hurry. Sorry to be the bearer of bad news.