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Originally Posted by accella4.4
Engine damge vs a paltry savings aside, isn't it a zero sum argument anyway? Before the X5, the Volvo R would run fine on 87 but a tank of 91 or 93 yielded more miles, so I've only run the 91 or 93 in the X. I only fill up about every 10 days, so if burning premo is an issue, I need to be looking at a bus pass.
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It is not a zero sum argument, and in my case, I don't think it is a cost issue at all. Measuring from fill to fill, over several tanks, my best mileage has always been on 89. YMMV, it depends completely on the quality of fuel you have access to. I use 91 when I travel, but at home, all my vehicles get 89. I do notice a decrease in performance with 87, and so I don't use regular, since it is obvious that the ECU is retarding the timing. That is not true with 89 pump octane, in my case. Again, YMMV.
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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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