Less current draw, thinner cables mainly. 40-60V or higher is also great for electrical motors and power electronic, but anything above 50V is high voltage, so

Less current draw, thinner cables mainly. 40-60V or higher is also great for electrical motors and power electronic, but anything above 50V is high voltage, so 48V is still safe enough. Cables in a passenger vehicle amount to >4 km and ~30 kg. I'm an electrical engineer working in an automotive related field.