Entertainingly, every time I go down there, the gas is still cheaper than self serve up here in taxeschusetts.
That's more than taxes. There is very good access to ports in the tri state area and so distribution costs are low. Even on LI there is a huge underground pipe that distributes fuel and gas to the island from further west. It runs out to just before riverhead. Though I make no claim it's one way or the other, I would not be surprised to find that MA taxes are lower than there.