Just curious to see what numbers other members get from their X3's (mine is a 3.0D).
Had a longist drive and got the following numbers. The journey was a cold start some town driving (Hereford down the A49 which is slow) then about 50/50 A roads and motorway, wasn't in a real hurry so stayed just about legal.
1st check 22miles in from cold - 50.2 mpg @ 43.8 mph = Eff of 94
2nd check at the end 338 miles - 45.4 mpg @ 60.8 mph
I did fill the tank at the end and the number looked about right.