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Old 12-06-2012, 12:06 AM   #11
Registered User
Join Date: Jan 2012
Location: Abbotsford, BC
Posts: 238
My Ride: 2001 325i
I've tried testing out 87 for a few weeks then going back to 92 and I've NEVER had a difference in fuel economy nor have I noticed any difference in performance in my 325i. I don't believe the ZHP has a higher compression ratio so the results should be the same for you. Many people will say you are stupid for putting in regular and that it will cost you more. Unfortunately I have not seen empirical data from these people. I do put 92 in my car regularly but I suppose it's because I can afford it and I really have no other reason. You will find many people admitting that they use regular gas and have for many years with zero engine issues.
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