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>...Yes, about 15% is wasted within the charger. But additional efficiency is lost between the power plant and your home - should we count that too? I'm being facetious with that question, but, it does help illustrate the point, no? ...
Except that all electricity used anywhere, anytime has to pass through power lines, but only the electricity you use to charge your car passes through your charger...
You forget that you pay for the inefficiency of the power lines... it just isn't a separate item on your bill. Conveniently forgetting that your charger uses 15% extra kWhs to heat your garage is like not counting the gas it takes to get to the gas station.. if your gas station was 60 miles away...
No matter whether you bought electric in order to be anti-fossil fuels, anti-Saudi-princes, anti-global warming, or just long-long-long-term frugal, that extra 15% is totally relevant as well as significant enough in magnitude to not be ignored.
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JHatchett 
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