Hopefully Jon you don't need your GPS to get to Niagara Falls anyway but good thinking about avoiding tolls sometimes you can't. We lucked out after the Niagara rally
heading to the Mississippi one crossing at Buffalo, no toll because they are only on the Niagara bridges entering Canada. Of course we had paid to get into Ontario at Port Huron-Sarnia in August!
Our method of planning route avoiding the interstates if possible is to map out ahead on the iPad and take screen shots of the route. Then I can glance at the maps if needed enroute and they much more readable than using the iPhone. We don't have data plan on phone in US so this is handy. We used this method in September past Buffalo through NY, PA, OH, IN, IL. Sometimes you can be surprised for example just off the route in OH was a state park at which we stopped, not the best sites but lovely new shower building. On walking that evening along the canal discovered the quaint town of Grand Rapids OH, so had to take Beth there on leaving the morning and could hardly get going that day for all her shopping!
Sent from my iPad using Fiberglass RV