Tesla is using Navi 23 RDNA in their new S and X models. That's 7nm chip. NN accelerators will likely move to 16nm or better soon. However, you're right that

Tesla is using Navi 23 RDNA in their new S and X models. That's 7nm chip. NN accelerators will likely move to 16nm or better soon. However, you're right that most automotive chips and power electronics use 180 or 65nm process. EDIT: Mobile Eye, EyeQ5 ADAS SoC is already 7nm FinFET.