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Man...this thread went overboard... Obviously, higher compression + lower octane gas= detonation (that's fact, not an opinion). The car can only retard the timing so far, hence the need for aftermarket ignitions and the like...obviously there will be a power loss, and it also detracts from the cars ability to retard the timing due to other factors (because the car is already compensating for the lower octane).
All I wanted to know is if people were actually getting detonation from 88-89 octane under all conditions (idle through 8200rpm, different weather conditions, etc).
Our cars have a high enough compression ratio to require 91+ octane, why would Honda tell you, in addition to 21k for the car, you have to buy more expensive gas if you want to use their product, unless it was necessary.
My original question wasn't doubting whether I needed 91+...I f'ed up and put in 87.
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