I had a experience on continuous drive of 1050km with 4 passenger and luggage, with mixed route of village roads, highway and a ghat portion.
I didn't find any lag issue while driving in hilly area, also i get a pretty good average too.
I didn't feel any tiredness while driving even i slept only 3-4 hours before going to the trip.
I travelled to gujarat via saputara from Maharashtra and return from the same route.
Overall I get a good performance from the car and it's my honest opinion. Before buying kiger i also test drive the punch, Triber but I consider the look and space of kiger has little advantage over these two and it is not disappoint in long drive.
The car feels premium and I didn't feel any drive issues.