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A car that runs on fuel cells only has a similar overall efficiency to a car that runs on petrol because a car that runs on fuel cells is designed to not pollute the Earth but you need renewable energy resources to generate the electricity which is like the efficiency of the petrol pollution.

That was what I put on my homework anywayz. :)

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Q: Why does a car that runs fuel cells have a similar overall efficiency to a car that runs on petrol?
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