As of yesterday, I have 17,600 miles on my 20" Dunlops. Front tires are down to 5/32, rears are around 6.5/32. I can see easily making it to 22-25K miles before considering replacing!

80%+ highway driving (NJ) - mix asphalt and concrete, rough surface.

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive