I am saying this cause I own one from the 2011 batch. 9 years and still going strong.
I believe the speedometer of your bike has been replaced/ reset few months before you bought it. I know this because once or twice the SVC mechanic had to disconnect wires of my bike's speedometer to look at some rattling issue from the front dome.
Also I think it would be best if you take it SVC and overhaul once just as a precautionary measure.
You can ask the previous owner where he used to get it serviced and enquire over there about all the works carried out by your previous owner and look for all the parts changed or any other issues the bike came in with.
As for mileage, if the vehicle was driven very hard previously it can give give you less than 25kmpl. I know this cause a person I came across in HYDERABAD used to get below 20kmpl.
As for me I use the throttle and brakes lightly. In the early years of riding I used to get 35- 38 kmpl easily.
Then again over the years I noticed switching to Michelin Pilot street radials reduced the mileage to around 30- 32kmpl.
Maybe flashing the ECU will erase what it learnt previously and tune to your riding. This should help a little bit but not by much.
I hope this helps.




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