moezer, I have noticed a huge decrease too but mainly because i've been running my x5 to heat up till i drive it away since its been parked outside so far this winter as the new garage is not uilt yet. I also moved from Airdrie to inner calgary and my kms/tank have gone from 650kms/tank to 450 kms/tank now
its crappy the winter we've had so far.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S