A theoretical study shows 77%, which is in the same ballpark: https://www.sciencedirect.com/science/article/pii/S1364032123011036 https://www.sciencedirect.com/

A theoretical study shows 77%, which is in the same ballpark: https://www.sciencedirect.com/science/article/pii/S1364032123011036 https://www.sciencedirect.com/science/article/pii/S136403212... A few percent here of there is not that important if the input energy is cheap enough.