Additionally I did specifically say that electricity would still be better for cars unless hydrogen production were such that more suitable uses were fully supplied.
Why do you quote a blog that mixes efficiency with other parameters as a source for power plant efficiencies?
In any case, you need to compare state of the art plants with each other, not a mixture of up to 70 year old plants with a new plant.
Wikipedia quotes 30% for diesel generation. https://en.m.wikipedia.org/wiki/Diesel_generator (see typical operating costs)
According to the EIA, natural gas has the highest efficiency at around 43% as of 2015. Coal, oil, and nuclear plants all fall around 33%, with nuclear keeping a slight lead. https://www.energyandcapital.com/articles/how-efficient-is-nuclear-really-/76858
Additionally I did specifically say that electricity would still be better for cars unless hydrogen production were such that more suitable uses were fully supplied.
Why do you quote a blog that mixes efficiency with other parameters as a source for power plant efficiencies? In any case, you need to compare state of the art plants with each other, not a mixture of up to 70 year old plants with a new plant.