States impose different taxes on their gas. Presumably if NJ allowed self-pump, those prices would be slightly lower.
However, in the grand scheme of things, the eliminating the payroll costs from the gas price in NJ would barely have any impact.
At a normal gas station which is neither busy nor desolate, an attendant may be able to serve, let's say, 30 cars an hour. If they each get $20 worth of gas, and the total cost of the employee per hour is $20, then the prices would go down only a fraction of a percent if he was eliminated.
