in amercia, despite our struggle for the reign of the oil industry, we get some of the s h i t t i e s t gas in the world. europe, japan, etc... have 100+ octane at the pump. thats why the new ITR isn't being released for a while because of its 11.2:1 compression, honda didnt want to release it in america with that kind of compression when the best gas you can put in at an affordable price is 93 octane, it wont provide the kind of reliability, or performance needed for a car with that kind of set up. honda tuner magazine tested a JDM K20A ITR engine on 93 octane and it ran like total s h i t till they got some 100 in it.
so...if youre planning on running 12.1:1 compression, i'd have a whole s h i t load of 104 on hand. jensen oil on 47th and redwood sells quality 104-112 at the pump for like $3-$5 per gallon. they'll also fill you up with 104 if you can get over the huge hump in the back. also, mixing 93 with tolulene will give you 98 or 99 octane, but that is one of the worst mixtures you could put in your car. it will f u c k up your valve's quicker than rosanne barr eating at chuck-a-rama.