Even worse than reduced fuel economy with under inflated tires is broken belts, tire has to be replaced. Made darn sure with each of my kids on their way to college had a tire gauge in their vehicle, and showed them how to use it.
A couple weren't very diligent on this, another had an excuse, where do I get air? Good question that not even our congress addressed, why I feel they are complete idiots, which is a compliment, more like morons.
This site proves my point on this subject:
Free Air For Tires! FreeAirPump.com
In all of Milwaukee, just one example, only one place offers free air. But you still need a good tire gauge. What are you going to do with TPMS, put a drop of air in the tires then look at the DIC?
With some places that charge a buck for air, don't even have a tire gauge on the chuck, and once you release the valve, have to kick in another buck.
Suppose you could carry a bicycle tire pump or buy a spray can.
Tube type tires were far superior to tubeless for holding air, still have these on an old boat trailer I converted into a utility trailer, check them a year later, still at 60 psi. Tubeless have about ten feet of extra length where rim leaks can occur.
Historically, first we had full service gas stations, would even check your tires for a buck's worth of gas in a price war could buy you seven gallons. Then tubeless came along, followed by tons of road salt to eat away at the rims, then an energy crisis where all full service gas stations bit the dust replaced by beer selling convenience self service stations without even an air hose at the pumps.
So what does our idiot congress do, make tire pressure mandatory, but not a thing what to do about it to get air. Kids living in an apartment building really have problems like this. World is going nuts!