N.Y. Comp. Codes R. & Regs. tit. 20, § 473.7
(b) A dealer or person who lawfully operates a motor vehicle without a load,
(1) under a dealer registration plate for one of the following purposes:
(2) under a transporter plate for one of the following purposes:
(iv) demonstration purposes;
is not deemed to be a carrier for truck mileage tax purposes with respect to such motor vehicle and may, therefore, operate it without obtaining a permit.
(c)
(1) Notwithstanding subdivisions (a) and (b) of this section, on and after September 1, 1982, an automotive fuel carrier must apply for a special permit and a distinctively colored sticker for each motor vehicle, required to be registered under the Highway Use Tax Law, used by it to transport, as a load, automotive fuel in New York State, other than a tractor or other self-propelled device which transports the motor vehicle holding automotive fuel. Thus, the vehicles required to be registered include any truck, tractor or trailer used to transport, as a load, automotive fuel, except tractors or other self-propelled devices which transport motor vehicles holding automotive fuel.
(2)
Tax Law, §§ 501(5), 502