Remember, E85 is ~105oct(in warmer months), so you would need less to make whatever desirved octane you want. A 5gallon e85 to 10gal 93 would yeild 97oct. That should be sufficient for map5 use, and i know there are N55's running those mixes without the flex wires.
Ok, so i found out what the Aral 102 is. It is not 102 OCT like we are used to seeing on our pumps in the states. Our octane rating comes from RON + MON / 2(known as AKI). Aral 102 has a RON of 102, MON of 88, which makes it 95 octane to our standards.
Info found here:
Octane Rating Wiki