It only takes a small amount of hydrogen so that you can cause a series reaction making fuel burn more once and for all. Also, when using hydrogen with gasoline or 30kw diesel generator, the engine will run much cooler and tight on carbon deposits build up which can produce problems within your diesel generator engine.
It can be predicted that many sedans could have Klein gas, Brown's gas, hydroxy gas, water fuel, call it what you will, fitted as standard by the majority 2030. Going without shoes is somewhat specious prediction, but it can certainly turn to be important. Not that it turn up useful info equally well on all kinds of car, truck, lorry or boat, be they portable diesel generator or gasoline battery powered.
Now, I would not go out and obtain two or three thousand pre-built hydrogen generator when you might build your own diesel generator with parts you locate locally prepare under $65.