think the other takeaway here is that if tire tech leaned towards efficiency, we could drastically reduce fuel consumption
First VW Golf "Blue Motion" (Eco model) we had came with low rolling resistance tyres; I could get 60 MPG easy, and 70 MPG with a bit of effort. Bought a replacement 3 years later, quite a lot of the Eco stuff had gone, it came with racey wheels and tyres, and consequently was hard to get any more than 50 MPG
More the fool me for thinking that buying a straight-replacement from VW would be like-for-like, although the salesman in the dealership clearly saw it as an opportunity to stuff the least eco wheels on it to make more money, even though he knew my purchase was specifically to be eco.
of course I was then stitched up by VW over emissions, so both the dealership and VW will never get my business again.
Actually VW did me a favour, because instead of just saying "I'll have another VW" I looked at the market and ... bought a Tesla
But based on my sample-size=one you are right about low rolling resistance tires being a dramatic improvement on economy. When buying winter tyres, particularly, I am heavily influenced by rolling resistance. Over here in the UK we have an A,B,C, ...F rating for fuel-consumption, wet-grip and noise (in dB) on tyres, so easy to compare them. The fuel saving (EV or ICE) by choosing a better fuel-consumption rating on the tyre will easily pay for some difference in purchase price over the total-cost-of-ownership period.
if people learned to COAST in their gas cars we'd also use a metric crap ton less fuel
I started doing that sort of Hypermiling more than 15 years ago on the school run. Back then I don't suppose the fuel injection the car has was as sophisticated as now (with shut off when lifting off the gas etc.), and nowadays I can't get as good an improvement with a modern ICE, but back then with stick-shift and coast-in-neutral instead of
accelerate-hard followed by
jump-on-brakes I was able to improve my fuel performance on that run by 1/3rd - very significant indeed. It did require that I taught myself to "Be at 50MPH and lift off, for the next bend, at THAT TREE"
, but that was good fun on a boring, repetitive, daily school run (on rural roads with little traffic)