Don't kid yourself on the 50i tt being much better. According to the OBC I get low 12s on my X6 with the performance upgrade mixed city/hwy. It's better on hwy trips. I got just shy of 300 miles on a tank going to MD this weekend. Otherwise I'm in the low 200s also. I never run the tank all the way down but it seems there is a disconnect. I'll be on half a tank after traveling 90 or so miles but the OBC says 200 miles to empty. Doesn't add up. I need to do a manual calculation and see what I come up with.

And my brake squeal eventually went away.

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Current:
2016 X6 ///M Black Sapphire Metallic