if your car requires 91 oct. (turbo, suprecharged, high compression) that is the min rating to avoid det. and knock. 93 would be better choice. no seeing as we don't have that..to get the best results of mixing fuel go off a 1/4 tank of 91 mix in aprox 1/2 a quarter tank of 100 you will raise your oct to about 95. thats using the fuel tank cap. of my evo. 14 gallons, 3.5 gal per 1/4 tank.
The + of upping you oct. is easy yes you get more knock and det. protection it will also allow you computer to pull less timing under boost (if you have a turbo car) allowing your engine to make more power.
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