Finger cross you will have the data later. Since 5X & 6P' launched I really want to know how this 5V/3A really works from 0-100%. Even Benson Leung couldn't or didn't want to answer about it :(
Re: nexus 6p car charger
Despite this is car charger thread, there is RAV 20100 power bank with USB-C 5V/3A input/output ports. Let's wait until somebody test it.