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Message: <blockquote data-quote="alantiong" data-source="post: 487532" data-attributes="member: 19754">Its funny to see this discussion here. A good argument and make us think a bit. To be honest, all of them are the same within 1.2% tolerance in terms of content. (between the brands). The integrity of the fuel depends on the logistic and storage of the fuel. The fuel will deteriorate and contaminated in storages and transfers. I know this as I am supplying the systems to them.  All our UDMs run perfectly on 95. Anything more is waste of $$. Unless you tune your car up to limit on the advance of your ignition, you will not experience much benefit by going 97. Infact if we have 92, i will run 92. For that 25% more in fuel price to compare with, it is a no brainer.  By the way, non of BMW engines will be harm by not using 97. Absolutely no harm at all. I am saying all these for the benefit of all and not just picking something down from the air. I am trained and educated in this topic so i do know a few things when it comes to Petroleum Products, physical and chemical properties of it.I hope this can let more people understand the myth about 95 and 97 and even Vpower. Would be more than to answer any doubts on this matter.We are paying lots of taxes for income and cars.. so why pay more? 25% for questionable improvement?CheersAlan</blockquote>