The subject has been pounded to death. This is only one of the many results found using the search feature. http://www.x5world.com/x5-e53-forum/...light=gasoline.
Most people have concluded that it makes no difference what fuel you use. Sooner or later it will be gone from your tank and you can just fill up with something else.

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People pay for what they do, and still more for what they have allowed themselves to become. And they pay for it very simply; by the lives they lead.
James A. Baldwin