Normal Speed =>87 Octane with Premixed Fuel Addtives
Speed 93 = 93 Octane.
Speed 97 = 97 Octane.
HINDUSTAN PETROLEUM = Power = 91 Octane.
INDIAN OIL XtraPremium = 91Octane and 93 Octane in Euro 3 cities.
CBR250R is good with 91 - 97 as people in Thailand use them and running fine. so i guess it should be ok for us too.
reference:Types of Petrol and Octane Ratings
here you can also read about engine knocking http://en.wikipedia.org/wiki/Compression_ratio




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