In the literature is difficult to find relevant data about the lifespan of fuel cell cars. According to DOE 5000 h of operation has been achieved, and the goal with a target is 8000 h. So, how many years car can last without the replacement of PEFC. 2h driving per day is -7 years? But how many km per 2 h, 50 or 100 or 200 km? Relevant papers do not take into account all important parameters, H2 consumption per 100 km, total distances per year or lifespan, etc. All the comments are welcome