= When enough excess power is available the rig is powered on and you mine for free.... In your car!
LAWS OF THERMODYNAMICS = there is no free power!
You will be burning more gas/petrol to power it.
Unless that power is already being generated by your alternator and wasted.
This is a fallacy. A car with it's air conditioning on consumes more fuel than one with it off.
I thought that was because engaging the air conditioning compressor adds a load to the belt system that was not there with the compressor off. Likewise, I thought the alternator was always engaged, to provide system power and keep the battery charged. Perhaps I'm mistaken.