usb-c in new car

• Yes, you can charge. But you obviously need a Lightning to USB-C cable.
• Possibly it will charge faster (f.ex. my iPhone 6 in my new MB); it depends on the current the outlet provides, USB-C > USB 2.

You should be able to charge using the USB-C ports.

Whether it will charge faster depends on the current supplied by the ports. Contact your car dealership or consult your car's manual for specifics on the ports.

2.1Amps at 12watts or more is required for fast charging.

He is referring to the Apple power adapter and you would need a power inverter to plug it in or a new Silverado pickup truck (and tell me, why when the light comes on after plugging it in does it make that loud "thunk" noise? My lights don't). But back on topic you don't need that adapter in your car and can ignore it. But check with your dealer (or the manual for your car, or the internet) and see if your USB-C ports are high power.

I don't think so. For the fast charging you'll need not only the USB-C to Lightning Cable but also the 18W Power Adapter.

It would depend on the cable you use and the amount of power the car is supplying to the USB-C ports. Check with your car dealer.