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One of the dirty secrets of FCEV's is they are quite intolerant of heat. And while they are more efficient than an ICE (which is damning with faint praise!), they are a lot less efficient than EV's. So, the heat they generate has to be shed much more effectively than we are used to.
I am not remembering the temperature limit for FCEV's, but it is surprisingly low - and this requires the very large cooling intakes on the Mirai.
So, the aero penalty for cooling on ICE's is roughly 10% (if I remember correctly), and it would be higher for FCEV's.
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