To get economy out of your ride you need to switch your self to relaxed mode: steady speed light-throttle cruising.
Under such conditions, performance is the last thing on your mind (unless you want to overtake). Such conditions are also most conducive to fuel economy and consequently we expect good fuel economy from the engine as well.
May be you will surprise but the most economical speed range for R18 is between 80 to 90km/h. with RPM not exceeding 2500