Wikipedia says that in practice, fuel cells are 40-60% energy efficient, compared to 25% for a typical internal combustion engine. https://en.wikipedia.org/wik

Wikipedia says that in practice, fuel cells are 40-60% energy efficient, compared to 25% for a typical internal combustion engine. https://en.wikipedia.org/wiki/Fuel_cell#Theoretical_maximum_efficiency https://en.wikipedia.org/wiki/Fuel_cell#Theoretical_maximum_... Comparing tank-to-wheel efficiency of the whole vehicle, fuel-cell vehicles average 36%, compared to 22% for diesel. https://en.wikipedia.org/wiki/Fuel_cell#In_practice https://en.wikipedia.org/wiki/Fuel_cell#In_practice Could you explain how you got the 10% / 20% efficiency numbers you mentioned? Your combustion numbers are in the same ballpark, but you got a much different result for fuel cells. Genuinely curious, thanks!