update here
https://www.pakwheels.com/forums/oil-fuel-fluids-filters/191345-motorway-trip-what-check-5#post3348608
but the more relevant part,pasting it here
today after all this,when i drove it,i felt that pick is much better now,but i didnt crossed 80 as mobiloil needs to be changed which will be done tomorrow
also i noticed that mileage has increased with new tires(205/60/15 to 195/65/15) as well
n also car has lifted up with new tires :o
cng refilled at reserve from turbela road for 657rs at full pressure since they were filling one car at a time
total mileage was 130km,50 in city rest on motorway n around 10-15km on turbela road with ALOT of speed breakers
anyways average comes out to be 5rs/km
it might have gone 30km more in reserve atleast on motorway