The diesel will be good for more than just fuel economy, with towing being a big one. If you've ever towed a trailer with a diesel you'll realize how much better they are than gas. They also tend to "scale" much better, getting nearly the same while loaded as when empty, which is not usually the case with gas. I just wish that BMW would raise the max tow limit on the X5 to 8000 lbs. or so...
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