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Fliegenfranz - I have an X1 sDrive18i too and drive at altitude, I do think the technical specs are optimistic. If I'm brutally honest this engine is underpowered for a heavy car like the X1 - it's nearly 100kg heavier than a 320i. Do remember this is a petrol engine, not diesel. What aggravates Cyee's consumption is that he only does urban driving.
Having said that Cyee's consumption is very high - I would certainly visit his dealer right now.
To further assist, we both have automatics and I use the Manual mode to save fuel - it definitely helps as I change up earlier than Auto would do, with no performance hit in normal driving.
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