System and method for storage and delivery of a fuel additive on-board a plug-in hybrid electric vehicle

A system for storage and delivery of a fuel additive on-board a plug-in hybrid electric vehicle having a purely electric mode of operation and a hybrid mode of operation and having a fuel tank configured to store a fuel includes a reservoir configured to store the fuel additive, a pump that delivers the fuel additive to the fuel tank, a first and second conduit, a controller that actuates the pump to deliver the fuel additive from the reservoir, an electric motor, a battery, and an internal combustion engine configured to consume the fuel during the hybrid mode of operation. A method of storing and delivering the fuel additive on-board the plug-in hybrid electric vehicle includes storing the fuel additive within the reservoir and actuating the pump via the controller to deliver the fuel additive from the reservoir to the fuel tank.