Eating during a 170 mile ride
I would look to stop at least twice and take on protein as well as carbs.  Try an omelette if you can get one on the road.  I would look to take some protein bars as well as energy gels, it will give variety as well as restore what you will blow through in 170 miles.  

You are also going to need to stretch, so suggest you plan on a 1-hour middle of ride stop...