There isn't a fuel shortage, it's that the stations don't have power to pump it. As more get power back, things will get back to normal.
I had a idiot gas attendant put 87 Oct in my fbo cobb 335 one time. Cobb told me to stay out of boost till it was all used up and go back to stock map. If you stay out of boost, you will conserve fuel anyway.
ESS 6XX kit