One reason I haven't heard yet is rolling resistance. With all the snow we've been getting, that's increased resistance on the X rolling forward, increasing the force needed to push the vehicle...Does the X increase shift points to warm up the engine faster?

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2006 X5 3.0i: Jet Black with Truffle Brown Interior, Auto, Navi, Xenon, Premium
2007 335xi: Black Sapphire Metallic with Black Interior, Manual, Xenon, Premium, Sport, Cold Weather