It's about 3 bucks in San Diego. I buy my gas at MCRD (I'm retired from the USN) for about 25 cents less, though. But, it's still expensive. My other car is a 2002 ///M Roadster which is easy on the gas. But, these X5's are thirsty. It's worth it though (for now).

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2005 X5 4.8is/ Imola Red/ Cream
2002 ///M Roadster/ Alpine White/ Imola Red (SOLD!)
2008 ///M5 ordered and on it's way!!