Respectfully, you're missing the point. People check tire pressures maybe when a warning light illuminates on their dashboard. And yet tire pressure is an important variable in all of this.
A useful reference: Low tire pressure significantly impacts fuel efficiency. According to the
US Department of Energy, for every 1 PSI drop in average tire pressure, gas mileage can decrease by 0.2%. The department also claims that you can improve your gas mileage 0.6%–3% by inflating tires to the proper pressure. So, if your vehicle gets 32 MPG, you could improve your fuel efficiency by .192–.96 MPG just by airing up your tires. That may not sound like much, but it adds up!
Learn how tire pressure and gas mileage are connected — from the science of rolling resistance to how many MPGs you’re leaving on the table, we cover it all.
www.firestonecompleteautocare.com
Contrast this data with observations made by others here, indicating that high efficiency tires made no measurable difference for their fuel economy.
My point: People broadly, and Government specifically, focuses on feel good action while substantial measures go neglected. The downside is possibly the financial cost to the consumer, and the impact this tire regulation will have for those of us in CA with unusual tire size requirements. It's hard enough finding the right fit as it stands.