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Before I did any modding I put 87 octane in my car 1 time.. I heard pinging ( Detonation ) and never put it in again.
So there are 2 tables your ECM runs . A high octane Table and a Low Octane Table.
The timings on the low Octane table are lower then the high octane, However your ECM will only switch over to the Low Octane Table if it detects X amount of spark knock events.
So its entirely possible you are not getting any spark knock with the 87 you are using and your car is just staying on the high octane map table ( Kind of Unlikely ) But possible I suppose.
The other thing is Higher Octane gas burns cleaner. Even though Direct Injection engines do not have gas running directly over the valves it still plays a small role in keeping them clean by burning clean. The valves will need all the help they can get to stay clean and not get all coked up. Run Good synthetic Oils .. Penzoil Ultra, Castrol , Amsoil and high octane fuel and you may never need a valve job.
Or just get a catch can from Tracy Lewis.
Also where you at in Florida ?
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