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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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2004 X5 4.4i Sterling Grey/Black Sport Prem 132s/Diamaris Rear Climate OEM Nav/Sirius RBs AngelBrights Roundel Valve Caps, 35% front tint. Sold MArch 2012
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