Genuine question, is it a good start? When does become not a gimmick? At 0.5g/km, 5g/km or 100g/km?
Because location doesn't matter, putting lots of small battery-powered mobile units is always going to lose to a large fixed industrial unit with an industrial-scale energy supply. Probably orders of magnitude worse on both CAPEX and OPEX.
I's clear that with many environmental matters, and specifically atmospheric CO2, we are at the tragedy of the commons, and have been for a long while, and strategies should be around getting us out of there.
No, we need to look at externalities and real world long term side effects.
The "per dollar" part is why we're in the current situation in the first place
No, because it doesn't scale, and its dramatically worse than a lot of other approaches, which range from 'also don't scale' to 'somewhat scale'.