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Hey guys, ive been speaking with a few guys that own some bimmers and was surprised when they told me what level of octane they used. One of them uses regular 87 on his 97 328i and this other guy who has a 95 m3 who runs midgrade 89 on his. Now don't these guys run the chance of their engine knocking? Doesn't BMW require that the engines be run only on 91+ octane gas. I know on some cars such as the 95+ nissan 240sx and 97 +honda prelude they say premium gas but since the compression ratios are very low its really not required. Also, in more recent cars because of the knock sensors the car is premium recommended but not required. The timing would be slowed down as well as the acceleration. What do you guys think, and what do you guys run your 325's, 328's and m3's.