If gas hits $10 per gallon what do you think diesel fuel will cost? Probably also $10/gal. Right now diesel is about the same or even a little higher than premium here in MD. I just drove my 4.8 to South Carolina (550 miles) and averaged 20.1 mpg.

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2007 X5 4.8i Space Gray
2001 X5 3.0 Titanium Silver