Hi..I own Bajaj platina 100ES of 2015 model, usually it gives me good

Hi..I own Bajaj platina 100ES of 2015 model, usually it gives me good mileage of 70kmpl in city driving (Hyderabad) but from last 2 months I have noticed that my bike struggling to pull even speed at 45kmph and mileage dropped down to 55-60 kmpl ..plz suggest anything I can go for mechanical care of my bike (my platina bike odometer is 51000 km now)

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