well according to the bottles you need only one bottle ie 500ml of good octane booster to get above 100ron 10% would be like 5L thats like 200bucks. I reckon just get the toulene, mix up a batch say 1L of BP and slowly add some toulene until you get the desired octane rating, then multiply this to the amount you need. You do have something to measure the rating otherwise you'd have no idea how high it is. That or just go to oran park they sell 102ron fuel their i think, like 2 bucks a litre or something can't remember