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Fuel cell vehicle fuel consumption measurement is considerably different from internal combustion engine vehicle fuel consumption measurement. Conventional Carbon Balance Method and Flow Measurement methods for gas consumption within combustion engines are not suitable for fuel cell vehicles. The small quantities of fuel consumed and the characteristics of hydrogen itself impose a challenge for the hydrogen measurement. This paper addresses fuel consumption measurement for fuel cell vehicles using various methods such as mass flow measurement, pressure/temperature/volume method, weigh method as well as other methods. The advantages and disadvantages of these methods are discussed.

Hydrogen Fuel cell vehicles, and techniques for fuel economy measurement and fuel economy calculations are considerably different from those traditionally used fro combustion engine vehicles.. Like gasoline or diesel hybrid vehicles, fuel cell vehicles typically use batteries or other power systems such as super-capacitors for load leveling. Thus, the energy transfer or consumption from these supplemental power sources to the drive train should be compensated for when determining fuel consumption or fuel economy. This paper addresses fuel economy calculations and testing for hybrid hydrogen fuel cell vehicles. The impact of supplemental power systems to a fuel cell vehicle's fuel economy and the various methods to derive actual vehicle fuel economy with supplemental power system usage are discussed.