Here is a simple chart provided by physorg.com that explains the efficiency of both models, that even I can understand!
They are being overly generous for the hydrogen case. 75% efficiency for hydrolysis may be achievable, but it would be the best case for high volume production. It cannot really be assumed that this would be the case for every refueling station since they have to be located in convenient locations. And where does the electricity come from? Is the hydrogen plant right next to the power plant? If not you need to add in some electric transmission losses. In the case for electricity it should just be noted that if you happen to have solar located nearby, then your transmission losses are less. Also, for EVs, pretty much anyone and everyone can achieve the numbers they show with the primary variable being the distance to the power plant, thus varying amount of transmission losses, typically, nationwide, about 8% to 15%. (The 15% being during high summer demand where power is moved long distances, most likely) Mike
