Found this article:
I tried a hydrogen fuel cell vehicle. Here’s what it was like.
https://www.washingtonpost.com/news/the-switch/wp/2014/01/24/i-tried-a-hydrogen-fuel-cell-vehicle-heres-what-it-was-like/
“Fuel economy obsessives will find lots to like about this car. On a full tank, the Highlander has a range of 300 or 400 miles, according to Chris Santucci, the Toyota engineer sitting in the passenger seat beside me. Filling up takes about five minutes — not much longer than your typical vehicle — but you can go much farther than even today’s best hybrids. The Toyota Prius gets about 50 miles to the gallon; the Highlander gas-electric hybrid gets about 27 under optimal conditions. The hydrogen-based Highlander? Sixty miles per gallon.”
“The Highlander gas-electric hybrid gets about 27 under optimal conditions. The hydrogen-based Highlander? Sixty miles per gallon.”
Later in the article it is mentioned that the hydrogen costs $5 a kilogram, which theoretically contains approximately the same amount of btu’s as a gallon of gasoline. The thing that is not mentioned is how many kilos the author is talking about when he says that the hydrogen Highlander is getting 60 mpg using hydrogen. A gallon of gas weighs 2.72 kilos. My guess is that the author is talking about 2.72 kilos of hydrogen when he says he is talking mpg using hydrogen.
One would assume that the article that started the thread is trying to say that using alternative energy sources they will be able to get the cost of hydrogen down to $.50 a kilogram or one tenth as much as it costs today. But who knows?
Currently 95% of hydrogen produced comes from fossil fuels because it is multiple times cheaper than producing it through electrolysis. So my guess is that the original article is based on a bunch of theoretical assumptions that are typical of any type of reporting on alternative energy.