Electric cars.

[old dog new tricks]

Because 34% of non-EV-buyers view battery life as a concern (the same number that are worried about not being able to charge at home), and at the moment it would be beneficial for encouraging confidence in EVs generally.

Plus having it done in a standard way would generate a ton of useful data across the industry.

Also a battery life tester is a relatively cheap bit of kit, that doesn't take long to use, compared to an equivalent report for an ICE car.

Totally plus one obdII reader can read endless cars little or no investment, not like asking to check the winding on the motors or anything like that the batter SOH is of course a major concern and it would debunk all the scaremongering