This study examines the pass-through between retail and wholesale prices of gasoline in Colombia. Data from 2017 to 2019 were available on prices and characteristics of gasoline sold by service stations in the main cities of Colombia. Information on the location of the stations is also available, which is used to georeference the stations and obtain the potential number of competitors for a station. The study results show an asymmetric pass-through behavior between retail and wholesale prices. Furthermore, the potential number of competitors of the stations has a direct effect on the retail prices and an indirect effect because it alters the stations' pass-through.