I've got a 4.6is that's been pretty good to me, but I'm looking for an X5 that delivers far better fuel economy. I figured the X5d would be the way to go. The ones ive test driven were decent to drive around town, and could keep up 90mph on the highway w/o issue.

Anything I should know about the move, and/or the vehicle itself?

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2011 Sapphire Black X5D
Burger Tuning JBD
Lux H8 V4 Angel Eye LEDs