Abstract: A system of fuel use and fuel production comprising a vehicle, a source of liquid fuel, particularly methanol or a methanol/water mixture, means such as a methanol reformer for releasing hydrogen and carbon dioxide from the fuel, an engine such as an internal combustion engine or a fuel cell which is powered by the released hydrogen and means on the vehicle to store the released carbon dioxide. By converting the fuel into hydrogen and carbon dioxide and by providing a store for carbon dioxide on the vehicle, the present invention allows the carbon dioxide produced in the process of powering the vehicle to be collected and stored for later use in fuel production. Fuel production means are also provided.