Back Pain problem

Back Pain problem

I am using dream Yuga since sept. 2016. After long experience, I got back pain due to it bed positioning staring handle and seat.I show some you-tube video and try to change my driving posture, However i go relief only 70 % only. I always try to maintain advisable posture but if company change the design of seat and height and angle of staring handle, on one has to be a causes while riding bike,

With respect to fuel efficiency it give 40 kmpl initially. Then i complain while servicing, They make some adjustment,and gave me 60 kmpl, in city reduce 3-4 kmpl and some time 10 kmpl. but on average, i can say it would comes around between 52-57 kmpl.