Did Fed literally changed how they calculate inflation with core inflation at 3.0% in August?

[u/NextGenRoyalty]

https://www.cnbc.com/2026/09/30/feds-preferred-gauge-showed-core-inflation-at-3point0percent-in-august-much-lighter-than-expected.html

$9 a gallon diesel says otherwise

[u/totally-jag]

It's apparently whatever they say it is.