Hydrogen vs. Battery Electric Cars

You talked about the relative "well to wheels" efficiency when the HFCV was powered by hydrogen generated by electrolysis, but as >95% of hydrogen generation uses steam reformation of natural gas, what is the well to wheels efficiency of that process?

Also, and perhaps more importantly, what is the carbon footprint in terms of CO2eq g/km of each of these?

It is also important to point out that as the electricity generation increasingly shifts to ultra low carbon sources (such as wind, solar and nuclear), BEVs and HFCVs that run on green hydrogen from electrolysis, all get cleaner. HFCVs powered by grey or blue hydrogen do not.

Regarding electrolysis, it is also important to note that high temperature electrolysis, possible at nuclear power stations, is 10% more efficient than standard electrolysis using electricity from solar and wind; so if we are to use hydrogen for transportation, then this should be the method of production. It also makes sense for decarbonising the grid, as the nuclear power stations could backup solar at night/wind during lulls, and retask to hydrogen production when they are not needed for backup duties.