Kezo has made a very valid point here. This post has galloped along with lots of speculation using data we know nothing about and some suggestions which aren’t practical in the real business world.
However, the premise of more money for less mileage used goes against the grain of what Motability is. It provides vehicles to people based on medical criteria, not financial. Whatever your circumstances, you qualify solely on medical eligibility. Everyone is equal in choice, AP and GCB. To seek to reward/incentivise individually is wrong.
This service get attacked in the media and you can imagine the headline writing itself. ‘Free mobility car user wants more money because he hardly uses it’.
As Kezo said, Dangerous road.