R.I. Gen. Laws § 11-18-13: Deception in sale of fuels and lubricants.

It shall be unlawful for any person, firm, or corporation, to store, sell, expose for sale, or offer for sale, any liquid fuels, lubricating oils, or other similar products, in any manner whatsoever, so as to deceive or tend to deceive the purchaser as to the nature, quality, and identity, of the product so sold or offered for sale.