OK, you don't have to reveal the details, but what is the magic that overcomes all the inefficiencies in harvesting KE, electrolysis, and the pesky laws of thermodynamics that make internal combustion engines so fundamentally inefficient?
And what's the magic behind "arm's length"? That truck is being pushed along by the engine. The only opportunities for collecting "free" energy is when you're braking, or in the unlikely instance that there's a hurricane force tailwind. And the not so minor gotcha about recovering that free energy is that to collect (say) 50 HP worth of braking energy, that's a 35 kW generator.
Storing that kind of energy presumably requires those just-around-the-corner supercapacitors. Perhaps the imaginary kind that EEStor patented but somehow haven't ever demonstrated in reality.
Then, the big question: why squander energy creating hydrogen to burn in an internal combustion engine, instead of just running an electric motor, which would be at least 3 times as efficient? That 35 kW generator would almost certainly be an EV traction motor, and electric motors can be better than 90% efficient. Turning electricity into hydrogen is less than 82% efficient and then burning it in an internal combustion engine wastes most of that energy as heat.
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