Someone once told me that they inflate more in front than rear? #1 to support more weight in front (engine) and #2 ~ bigger ratio of rear wheel drive power, so you want the tires less inflated in back to grip road better? You guys ever heard of that?

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2008 BMW X5 4.8i ... Tit. Siver/Black ... Fully Loaded

"Gone but not Forgotten"
2006 BMW X5 4.4 .. Black / Black ... Fully Loaded
2003 BMW X5 4.4 .. Black / Black ... Fully Loaded