17.4R1. For the purposes of section 17.4 of the Act, a retail dealer must have posted in such manner as to be clearly visible to the purchaser, in the dealer’s establishment, the retail sales price of the fuel including the taxes imposed under the Act, Part IX of the Excise Tax Act (R.S.C. 1985, c. E-15) and the Act respecting the Québec sales tax (chapter T-0.1), as well as the retail sales price of the fuel without those taxes.