Hero Motocorp — complaint about mileage

Address:

Fugewadi, 411027

I bought passion pro 110 for that 84 is the company's mileage given and dealer said it will give atleast 70 average. It's been 6 months i bought this bike still struggling to reach 60 average and even back wheel also got punctured i have to change the tube with new one in just 6 months.
I went through 3 hero services centers even though no solution provided everyone is arguing just like you will get average after 2000km some says 4000km and another says that after 2to 3 services you will get good average.
I am getting only 50 km/ltr average currently. See the difference between committed and current average of my bike. I don't know what is the issue in bike either they sell me a damaged product or may be made changes in bike parts. Just helpless after visiting 3 hero services.
Need help for the same i want to inspection for my bike from each part of the bike.