^ US gallons. Why would a US spec car be set to imperial? We don't even use that here.
30mpg is completely reasonable with the estimates. The Touareg and ML with their 7/8 speed autos achieve 30+mpg highway easily.
2011 X5 xDrive 35d Red/Black: ZCW, ZPP, ZRC, ZTP, 300, 386, 496, 4AB, 6FL, Combox, LED Coronas. 04/11 Production