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I lease my 28i and only use 93 octane. All of the fueling stations I've seen here in Texas have ethanol blended, so I can't say if that makes a difference or not. I can say that I didn't have a choice once and had to put in a small fillup of 89. The X3 ran, though it was less than 19mpg compared to 25mpg the tank before. Promptly filled up with Chevron 93 afterwards.
Definitely not worth the risk, given the slight cost increase. Less than 10% difference here in price.
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