I have no tried it. But, I work in the industrial gas industry and I wouldn't put a hydrogen cylinder in my car no matter the gas savings. I have yet to see a cylinder that would be considered safe to carry in a pick up unless you have some kind of cage around it.
ive seen a system that a guy put in his 4.3 V6 s-10 that used a secondary 100 amp alternator to run current through some sealed containers of water in the bed, with a collector tube at the top that went to the intake. the thing (he built it himself) seperated the hydrogen and oxygen from the water and he saw a 15 mpg increase, no word on whether or not its still running though lol
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