The Elf fuel is 102 octane also so just get the BP stuff. It'll run fine in anything design to take unleaded, but to take advantage of it, you'll need to adjust/increase the compression. All the guys local to me running RS's run Avgas/98 RON mix 80/20 with A747. The 20% unleaded just helps to increase the volatility...
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NSR300R - Why did i ever have a 250...