Bangor Bob
Member
This is where you REALLY get into the 'Lies, damn lies and statistics...'
OK... the only truly scalable, and sustainable source of H2 is electrolysis from solar/wind. In that case an FCV is really just an inefficient BEV with a faster charging time.
The EPA rating for BEVs is 'Wall-2-Wheels' meaning how many kWhs of ELECTRICITY does it take to charge the battery enough to get X miles. EPA rating includes charging inefficiencies.
If we're going to be honest about this then FCV rating should be done the same way; How many kWh of ELECTRICITY does it take to get enough H2 into the tank to get X miles. Since electrolysis is RARELY >60% efficient that's really ~40mpge.. not 67...
Compressing it to 7.5 or 10kpsi takes non-trivial amounts of energy as well.