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My understanding is that the premium fuel offers better additive packages to keep your injectors and valves cleaner compared to regular from the same brand. That being said, bucketfoot is correct in that your car won't die from it. I tell all my customers that they don't know if they're actually getting the grade they're paying for. Who knows whether or not the tanker driver wasn't hung-over and put the wrong hose in the wrong hole? The car's knock sensors will keep the car from hurting itself but it may also retard the timing mapping and performance may decrease. Newer BMWs say right on the gas door that 91-octane is recommended but that 89 is the minimum that should be used. The newest even say BMW recommends Shell fuels, but I don't do that, either. The premium from my local Sam's Club costs less than the regular from the nearby Shell station. I've used Kroger premium for decades ever since following the tanker truck from the Shell station to the Kroger fuel outlet. Hmm
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