I am returning from upstate NY at the moment. My strategy was to stay on the interstates. I took 81 to77 to 95. Filled up at 1/2 tank and only had one stop where they only had 87 octane. Gas buddy shows rural areas with limited fuel options which I thought would be hi test but maybe they are shipping 87 as a priority. I am at the Georgia Florida line and good to go back to Sarasota. Asheville and the DC area were hard hit. I suspect that big cities in general are a problem based on population and hoarding.
I can add that I have been staying at rest stops as I was uncertain about booking ahead. When trying to book campsites last minute they were full or unable to book. Walk ups are less likely due to COVID restrictions. Most gas stations and businesses are requiring masks but not enforcing the policy. In some states I was the only one wearing a mask.