Fuel cells using hydrocarbons, methanol, and ammonia fuels, and air as oxidant, are evaluated for vehicle propulsion. Progress and problems in the direct and indirect use of these fuels in fuel cells are considered. In the indirect systems, they are first reacted to produce hydrogen containing mixtures, which are then oxidized in the fuel cells. Comparisons are made with present experimental fuel cell powered vehicles, which use expensive and dangerous fuels and oxidants. Fuel cells are also compared with present and proposed new high energy density battery systems for vehicle propulsion.