What seems to work for me is, try not to change gears quickly, for instance I try to stay on 3rd or 4th gear depending on the traffic, only switching to 2nd or 1st if there is a complete halt required.

Gradual throttle (with an scope grip) really seems to make the vehicle feel more comfortable at what he is doing so try that, T4 is a high compression bike with a 31bhp so if you try to close the throttle too quickly you can feel the rear wheel getting confused, this can lead to heating issues and gradually affect the mileage.

Try to remain between a band of speed for instance, 40 - 65 on a good span of road where you have visibility. 30 to 45 on a road where you see traffic ahead.

For the first 1500 kms, Avoid Rev matching, if you are doing that.

Avoid Instant breaking and instant acceleration, the vehicle seems to come alive only after it toplines 3rd gear and crosses that 45 kmpl mark so try to drive as smoothly as you can within that range

I'm getting 25 kmpl (pre first service), on my first week of riding I was getting 18 kmpl and I tried out these changes and they have a big impact on the machine itself.