I never take route taxis for 20 mile trips, just for little jogs of a couple of miles up the beach to the round about or up to cliffs from roundabouts. I share the ride with however many fares can cram into the taxi--sometimes just me in there or sometimes crunched up people on other people's laps. So it is apples to oranges asking for the price of a 20 mile ride in NY in a cab in which you are the only passenger--which in fact I have never done. My understanding of the route taxi system is that it is a set fare from point A to point B. But as said before, I do tip when I can.