i purchased my yamha bike r15 3yr. back i am facing after sales service since i have purchased the bike i called yamaha many times but only one thing they say is that on next service your problem will be resolved on running about 2km my bike engine heat so much that i have to give a break to my journey for some time and it happens again and again for a short time

I brought a new SZR as Yamaha has told that it gives an average of 55-60km/lt hoping that it may give at least an average of 50 in City and Hills but its just giving me 30km/lt everywhere. Whats wrong with it...i am doing servicing regularly and changing Bike engine oil in every 2000 km. Whats wrong with this bike or else is Yamaha cheating its costumers..... i am freaked out now putting petrol and its just frustrating your bike drinking petrol like a hungry shit.