Is syngas/synfuel [1] a viable route? Obviously it would be less efficient to produce than pure hydrogen (anyone know how much energy would be lost in the hydrogen conversion step?) and probably cannot compete with natural hydrocarbons with current tech, electricity prices and carbon taxes. However compared to pure hydrogen it should have a couple of advantages: compact (same energy by volume as current fuels) and can take advantage of current infrastructure. If done right it could probably power both current ICE vehicles as well as future fuel-cell vehicles. Can anyone comment on any major downsides except it not really being economically viable with current tech.