Quote:
Originally Posted by YETTI
Just wanted to what octane rating you all use and your opinion on it. I usually run 89 with the occasional tank of 93. And I drive a 2006 4.4i
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On my 2003 X5, my best mileage ever was on 89. No retarding of timing, no performance degradation. 87 resulted in a slight decrease in performance; 91 was throwing money away. That was on my local fuel.
The reason you get so many different responses is because fuel varies widely across different geographies. I knew my local fuel quality. When I travelling I bought 91 because I didn't know the local fuel quality.
What it says on the pump isn't necessarily what you get.
When BMW states 91 they are allowing for that wide variance. Some percentage of customers will need the 91, others not. If you get any reduced performance or reduced mileage on 89, buy 91. If not, save your money and buy 89.
Worry more about ethanol. It matters.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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