i consider myself as medium hyper-miller and using stock GTRadial tyres.
driven initial 1500 KM with 26psi in all 4 wheels and got around 19KM (didn't check tyre pressure after taking delivery so...)
next 1500 is done with 36psi (recommended by suzuki) and achieved around 20.5.
i mostly drove on kashmir highway and M2/M3. so my figures should be taken as highway driving.
PS: i use to get around 17-18 on my cultus on same routes.