hmm old engines like d15b love hi-octane.. you can feel the performance increasing, as for PSO , i never fill from other stations except Caltex as they play the quantity trick with you. once i noticed that when they are filling petrol you see theyre hand on the nozzel and if you carefully see at end or somewhere in between they do some pulling back and forward in the lifter in the nozzle , where as all gas stations in islamabad are automated you just click the nozzel and itll automatically fill up petrol to the punched number like 1000rs on the screen. My friends have also noticed this and also have shared this with me as well(fuel ending before its due expectence). whereas in Caltex in i-9 they just pull up the lifter in nozzle and then take their hand off the thing , the petrol fills up automatically.
Ive gotten petrol from PSO once when my petrol was at end and majboori lead me to it , i filled up 1000rs petrol and when exited the station, car started chocking , it was kachra in the petrol , gave it a engine cuttoff once to remove it .. whereas in same situation ive never had this kachra prob from any other station