Is this question specifically in regard to charging phones? Or is it a bigger question of “is my home electric more efficient than the electric from my car”
If it’s the first one… It doesn’t matter. None of it does. Phones use so little power relatively speaking that there is no efficiency gains or losses by using different sources.
if it’s the second one… Home energy is generally more efficient, unless you want to look into power footprint of that energy up the path to the power station and how that energy is generated, but also something you have little control over.
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