Carlos Pires has put together a little site that automatically grabs the Petrol Prices set by the Direção Regional de Economia e Transportes Terrestres and displays them in a more readable format.
Petrol Prices change each week at midnight Sunday, and the same price is rolled across all petrol stations on the Island.
The site updates automatically as soon as the DRETT publishes the information, sometimes they even publish the prices a week in advance.
The site URL is https://gasoleotoday.herokuapp.com/