Neither of our cars have a USB connection but I suspect trying to upgrade one is game not worth candle territory as you'd (presumably) need to locate and upgrade the 12v/5v converter. OTOH USB chargers delivering as many amps as you need that plug into the 12v ciggy lighter derived socket are pretty cheap.
It's only in last few years that micro USB has become default/universal power connector. Prior to that it provided a few hundred milliamps piggy backed onto a data connection.
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