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USB-C with power delivery is a different beast, it supports handshaking so both ends can decide what power and voltage to charge at, and can go up to 100W
https://blog.ravpower.com/2018/02/all-about-usb-power-delivery/
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Not necessarily, at some point you will break even with a more efficient car and it may be sooner than you think. https://youtu.be/L2IKCdnzl5k
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