My bike beats the Ninja 250 .. yup.. not in top end not in accelaration but in mileage

Recently i observed my bike is giving a mileage 22-24 km /litre

i didnt notice it till i went for the Road trip ..
i checked it atleast 5 times and yes i am right . The mileage i get varies from 20-24 depends on the speed i ride. When i ride at 60-70 the mileage i am getting is 24 . I already told this to service centre guys they have no idea . they serviced it and told eveything is ok now but no change.
Airfilter is new , spark plug is NGk iridium . All other things are stock .
No modifications except Michelin tyres. Any one any idea ?
clutch plates are 16 K old but i dont feel any accelaration or top end reduction . earlier bike used to tocuh 130 now it is touching 120 eventhough there is a slight missing feeling at 120 's .
i couldnt observe any black/white smoke . but what i noticed is the engine oil level is also reducing much faster than normal rate ..
Any suggestion?



(80-90 speedometer )


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