The lowest I ever saw was .26, two black-owned independent gas stations near Detroit having a price war. That was mid-60’s. By the time I was 16, there were the Jimmy Carter waiting lines at the gas stations, and it was up to an outrageous .55. That would be 2.22 in today’s dollars.
I remember $.25 - .29 gas in the 60s as well. Yes, you could get someone to pump the gas for you, wash your windshield, hand them a $10.00 bill and get change.
We were getting gas for our farm tractors for under $.20, but weren't supposed to use it for our cars. Well, DUH!