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ive ran regular(87) for the past 4yrs. just fine
 

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Car should run just fine on 87 octane, unless the PCM has been tuned for premium. Is the car all stock? Mileage? Post your car make model, recent maintenance items replaced, and symptoms in the maintenance section and you'll get some responses as to what it could be.
 

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If your PCM hasn't been retuned for a different octane, and 87 doesn't run properly

a) you have a problem somewhere
b) someone modded the engine to require/prefer more octane, but failed to properly retune the PCM to account for it (this happened to 'dogma')
 

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I tried switching to 87 from 93 on my under 30k ss a few thousand miles ago after reading that im throwing my money away with high test, and i didnt like it. I can't recall exactly why, but i think it had somethin to do with a hesitation and also engine noise.
 
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