I recently purchased a new in-car USB-C charger, and I have to report it is a complete success. I recharged the 13 MacBook Pro from about 45% to full, whilst using it to edit photos, in about 45 minutes. The charger got a little warm, but not enough to worry about. It will also charge a mobile phone as well, but as I have a dedicated power supply for my iPhone I haven’t needed to try it.
I purchased it here, it may be available cheaper elsewhere.