Depending on your application (and especially on the weight of the plane), you and the P.A.W. 80 will probably be happiest with something in the 6-4 to 7-5 range. If you use APC's, please sand off the razor edges of the LE and TE!
Mine like Dr. Diesel's "Olde English Blend" fuel; Aerodyne is also good. I have some RedMax, too, but haven't tried it. A gallon of this stuff goes a l-o-n-n-g way!