I was following friend @ 50-55 mph from New Haven CT to NJ (she had a flat tire and was driving on a donut), and found out that my diesel can get 45 mpg at that speed ! (fully loaded with 4 people and trunk to the roof)

__________________
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