Hey!
I am 6ft 7 inches tall and I could say for everyone taller than 6ft that we cannot sit comfortably on any seat in an Alto K10 without disturbing the comfort of those sitting in front or rear. I have tried sitting in the front seat next to the driver's side by pushing the seat behind but that reduced the leg space for the person sitting behind my seat. Similarly, when I sat behind, I had to push the front seat ahead and that reduced the leg space in the front seat.
In conclusion, it's manageable but not comfortable.