On 19/10/2019 19:49, JNugent wrote:
On 19/10/2019 18:39, MrCheerful wrote:

In the real world the additional load of headlights on a car
(especially a modern car) would be very hard to measure, and certainly
not discernable tank to tank.

It won't be discernable to the owner. Just as the many tiny things a car
manufacturer develops in the lab are not separately discernable.

Just because you can't discern something does not mean it does not exist.

The "extra load" is not discernible at all. There is a buffer in the
form of the battery.

Perpetual motion is impossible. There is a Law about it.