Citi released the 5% quarterly category for the third quarter of 2024 (activation required):
Gas Stations – Useful for gas and also for buying gift cards inside some gas stations and similar convenience stores
Citi is different than the other cards in that you have a $6,000 annual cap rather than a $1,500 quarterly cap. You can get 5% back on up to $6,000 in this quarter or you can save the entire amount for a different quarter, or you can use part up each quarter.
Hat tip to reader Jole