Abstract: An in-line fuel treatment device improves fuel efficiency and decreases the quantity of harmful gases produced as the result of combustion. The device comprises an elongate hollow tube having an inlet end and an outlet end and is adapted to be connected in-line with the fuel line proximate the apparatus fuel intake. A plurality of magnets are positioned proximate the outer surface of the tube and a non-sacrificial catalyst is positioned within the tube. In a preferred embodiment, the catalyst is a naturally occurring silica in the form of quartz crystals.