Growing corn is cheap, but there isn't enough arable land on the planet to replace gasoline with E85. How much hydrogen is required to replace 1 gallon of gasoline for an equivalent amount of useful travel in an average car? How much gasoline do we consume as a nation daily? How big does this new hydrogen plant have to be to replace 10% of our daily use? How long will it take to install adequate infrastructure all over the U.S. to make travel in a hydrogen car even possible?
Those are all good questions (to which I don’t have the answers). I’m skeptical of the so-called hydrogen economy too. I was just replying to your point about the power output of the hydrogen generating facility being an important consideration but that slower power can be offset by more generating plant if it’s cheap enough.