This is a best example to share when we talk about chemical change, that the products have totally different properties from that of the reactants , from which they are made.
Now coming to the answer,
Formation of water is a highly exothermic type of reaction and a lot of energy is lost at the time of reaction and the bond formed is having very less energy. And thus it can not yield more energy on combustion.
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I am M.Sc (chemistry ) from punjabi university.
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