I drove 1800 miles in a Hydrogen Car

Toyota voluntarily omits to mention the ramp up time to max output power of the fuel cell stack they are using!  This leads to Toyota bridging the gap using a small capacity High Voltage battery like in their hybrids to help with acceleration or when you are flooring the pedal.  I remember in the 1980's Mercedes was pushing its Hydrogen vehicle, which we are still waiting for . . .