500 is easy to achieve on the highway; as long as you are not in a hurry. Although my best is about 530, I can seldon drive slow enough to achieve this if I am traveling that far.

After all, you are talking about a difference of about an hour and a half. I'd rather have that 1.5 hours than the extra $12 - $15 dollars in the pocket.

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2006 X5 Sport 4.4i