If they're looking to improve tire energy efficiency with regulation, shouldn't they also make it a citable offense to drive with tires inflated below 30psi? You could probably even train a ML algorithm to recognize images of vehicles with underinflated tires, and send the driver a reminder!
We are part way there, gas stations are required to provide free air and a gauge to customers buying gas.
Doesn't TPMS take care of that? Though, it seems like it's being done in software now to save costs...
Then people will drive around with them at 60psi (i.e. doable but not great for a car tire) and wonder why they keep breaking belts.
That’s probably sooner than you think.
DOTs are intercepting trucks with drones and measuring wheel temperatures and other metrics to do targeted enforcement rather than pulling over every truck. There’s also pilots of road sensors that can weigh trucks and perhaps other metrics.