Hydrogen is viewed by many as the most promising fuel for light-duty vehicles (LDVs) for the future. Hydrogen can be produced through a large number of pathways and from many feedstocks (both fossil and renewable). A key issue in evaluating the sustainability of a hydrogen fuel cell vehicle (FCV) is an analysis of the processes employed to produce the hydrogen and the efficiency of its use in the vehicle, the ‘well-to-wheel’ (WTW) activities.