Looks my bike is gulping more fuel

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I have a economy motorbike. which generally gives mein around 60 killometers per litre. but from few days I am observing that it is giving much less then it generally gives. May be due to lack of my attention. but I really dont want to get it more bad.......so I will take it to service station by first available window of time. I love my sweet 13 year old bike....cant tolerate to loose.............