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750.....I have used all three 98octane fuels and cant honestly say I have noticed any difference

I do use methyl benzine(toluene) with 98octane fuels when I go to the dyno or track

It doesnt give me a major increase in power(as compression ratio doesnt require it)but the throttle response is much much sharper and over all engine smoothness is better

Its estimated that for every 5% toluene you use you will get 1 point octane increase(as per bp email I received)

Tell me more about this 102 fuel you refered in your initial post....

The table below is from my email from bp.......


Fuel RONtypical MONtypical Air/fuel ratioby massstoichio- metric Air/fuel ratioby massmaximum power # Latent heat of vapour- isation MJ/kg Highestusefulcompression ratio *
BP Lead Replacement Petrol 96 85 14.4 12.0 0.34 9-9.5
BP Premium Unleaded 96 85 14.4 12.0 0.34 9 - 9.5
BP Regular Unleaded 91 82 14.7 12.5 0.34 8.5 - 9
BP Ultimate 98 87 14.4 12.0 0.34 9.5-10
BP 100 Racing Fuel 110 100 15.0 12.9 0.36 11.5 - 13
BP Methanol Racing Fuel 115 91 6.5 4.5 1.17 15 - 17
Toluene 124 112 11.5 9.8 0.41 13 - 15