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I would second Nick's temperature sensor theory.
If the ECU is being sent the message that it's still cold outside it will effectively run it with the choke out.
My M900Sie has smelly black tail pipes, but burns no oil, has very pale brown/grey spark plugs and returns 68mpg.
She pulls like a Saturn V and runs super smooth at low revs so long as I change the plugs at Circa 6000 miles. They are past their best by then and she can falter a bit at very low revs and generally feel a bit off tune...Sometimes they go a bit past 6k.
Might also be an idea to consider having the injectors ultra-sound cleaned?
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