I vote that you go for it. Maybe I'd stay on the full side of a quarter-tank, though.
Page and I are planning a trip to CO later this month and plan to return home around the end of October. Hoping to see beautiful fall colors and get some hiking in (day-hiking, that, is). We're putting our list of must-sees together as we speak. I think the only thing that would stop us is word that shortages got worse. I don't see that happening. I also don't see prices coming down, but I do think they will not climb so severely as they have unless there is another shock to the system.
Have a wonderful trip.