Good bike. I get 55 kmpl, always use proper gear. Bcs so many people have complained about its chain sprocket problem. Something is there, but most of them upgraded from Hero Honda bike. In which you can go slow even with top gear. But, it is a big mistake to ride Unicorn with top gear in low speed.
I can tel u that u must accelerate up to 40 kmph in the 4th gear to up on 5th. From my experience, I can say 40-50 speed is gud for 5th gear in plain area. In upwards slope, ur bike must have 60 speed range.
While u up the gear you must do a rapid acceleration and then slowly up gear. So ur chain will last for much more kilometers. Use rear and front brake together.