实测平均效率在36%左右，实验车型可达60%。锂电池效率大约在90%-95%。 https://en.wikipedia.org/wiki/Fuel_cell#Efficiency_of_leading_fuel_cell_
types
In a fuel-cell vehicle the tank-to-wheel efficiency is greater than 45% at
low loads[65] and shows average values of about 36% when a driving cycle
like the NEDC (New European Driving Cycle) is used as test procedure.[66]
The comparable NEDC value for a Diesel vehicle is 22%. In 2008 Honda
released a demonstration fuel cell electric vehicle (the Honda FCX Clarity)
with fuel stack claiming a 60% tank-to-wheel efficiency.[67]
