lion9car…utube has a demo of just such a test and it showed little if any measurable difference. But this is a gross test, not done at speed and over time where cumulative small changes become quite significant.
Auto engineers, tire manufactures and every one it seems with a degree and a real “need to know” that I have found seem to agree…there is a change.
Otherwise,as “Shadowfox” says…it’s “magic and pixie dust” The difference is routinely measured as an indicator of tire pressure change in indirect tire pressure monitoring devices as 'Same" and others have suggested.
The lack of observed gross measure difference is why some just can’t seem to “not believe their own eyes”, don’t trust car and tire makers and keep bringing this up.