The main goal of this paper is to report emission tests results achieved with the Power Pack™, an Increasing Oxygen device for enhancing fuel efficiency of internal combustion engines in mobile sources, fabricated in U.S.A by H&G Fluid Stabilization Technology and evaluated in Colombia under the sponsorship of DEL LTDA.The Power Pack™ is installed properly on the fuel supply line.When the fuel flows through its internal parts where it exposes to two neodymium magnets, negative charges are transferred through a grounded wire and becomes positively charged.Then, when the fuel mixes with the air, near complete combustion is obtained.Five cars and five motorcycles were tested without and with the device installed to analyse emissions variations.Two types of tests were made: Single Day Tests; two tests, for all the vehicles, with and without the device installed, and Periodical Tests; with the device installed, for chosen vehicles, in different days, to check emissions variations over time.Carbon monoxide and hydrocarbons emissions results were obtained from gas analysers of two Automotive Diagnostic Centers in the city of Cartagena, Colombia.When results of Single Day Tests for cars were analysed, remarkable average emissions reductions of 75% in HC and 71.73% in CO were obtained.For motorcycles, remarkable average emissions reductions of 74.32% in HC and 75.38% in CO were obtained.From Periodical Tests results for the studied car, final emissions reductions of 57.30% in HC and 27.71% in CO were obtained.For the first studied motorcycle final emissions reductions of 28.65% in HC and 41.53% in CO were obtained.For the second studied motorcycle final emissions reductions of 72 % in HC and 15.92% in CO were obtained.All the vehicles fulfilled the Colombian norms after having the PP™ installed.