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Unlike internal combustion engines, fuel cells cannot deliver full power upon cold start. Furthermore, while low temperature fuel cells are capable of cold start, medium and high temperature fuel cells are not and must be artificially heated to start. This paper analyzes the warm-up energy requirements of the three medium and high-temperature fuel cell technologies and their influence on the vehicle fuel consumption over various drive cycles. The appropriateness of each technology for a given type of vehicle is assessed. It is found that high temperature fuel cells are inadequate for the intermittent use characteristic of vehicles drive cycles. More research is required as this study is inconclusive for medium temperature fuel cells.