When I bought my car the dealership told me to put 91, 93, or 94 octane in because if I used 87 the ECU would retard the timing and I would get bad gas mileage. Now this could be an old wives tail but I have always put 93 or 94 in the car. But if this is true wouldn't the ECU also compensate for changes in the amount of air going in by itself?

Just a thought...but I am putting an AEM CAI on my car this week when it gets in so let me know.

Thanks.