i have a 65 9.5hp evinrude. i am the high altitude guy, i need to know how high of an octane rating i can introduce to my motor. i have the option of these: 87,89,91,94pro,96highpro,98streetperf.,<br />100dragfuel,100purple avgas,101hybrid race,and<br />104(the red juice) i can get all said...