If you have a smartphone, download the Gas Buddy app. I just looked along 75 and there are a lot of stations with prices updated/confirmed within the last 2 hours. It doesn’t guarantee they are open but who would confirm a price if they were closed or out of gas. Having worked in catastrophe areas for the last 25 years, truck stops, Walmart, and member-clubs like Costco, Sam’s, and BJ’s, etc. tend to be open and have gas when others don’t.