The document discusses a method called the Cottell Process Reactor (CPR) for treating fuel before combustion to reduce emissions and increase fuel efficiency. The CPR uses water to emulsify fuels into precise particle sizes without moving parts or high pressure. Benefits include reduced fuel consumption, emissions, soot, cleaner engines and less maintenance. The emulsion is made on demand without additives or storage concerns. It can be installed on existing fuel systems and easily reverted back to only fuel.