he could have an O2 tank pressurized by a turbo-exhaust unit and used at will plus a water recovery unit in the exhaust for the H2O injectionHe’s using some kind of supplemental power source and not counting it into his MPG figures, but he is counting it into his horsepower figures.
Like a tank of compressed air, or compressed hydrogen, or a storage bank of batteries.
he could have an O2 tank pressurized by a turbo-exhaust unit and used at will plus a water recovery unit in the exhaust for the H2O injection