The energy of Hydrogen & petrol is very different, 1L of hydrogen gives a lot different power to 1L of Petrol.
Hydrogen: 4.6kg ~=115 L which equals 40 L of petrol if you measured at the wheels.
These two below will both give 500KM in a small / mid size car.
Hydrogen should be cheaper to refill ( in the 2030s), but obviously tank takes up 3 times the space and cannot be conformal like liquid tanks. So fine in larger SUVs, but not good in small cars.
(also need to add weight for the fuel cell & small battery, roughly offsetting the engine)
POWER!!!! Fortescue Future Industries, page-2681
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