Human with super efficient metabolism

So I read recently this article as I was trying to design a sci fi alien race for my story and I found out that a human only has an efficiency of converting food to energy of about 25%. What would happen if somehow through a fluke of biology this alien race being very similar to humans had a metabolism with an efficiency of 75%.

What would the effects be? Would it allow them to go for weeks without air or food?

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Human with super efficient metabolism

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