Last Pakistani pump you'll find is at Windar.
Then in Gwadar city.
I take along a fuel can. But it is a safety risk and then the smell also causes allergy.
My suggestion:
get your tank full with hi-ron from a trusted pump in Karachi
At Winder, refuel fully with regular Pakistani one
Before tank gets half, around Ormara, refuel again with Irani one. Don't wait for the tank to get empty so that it blends well.
Refuel again in Gwadar with regular Pakistani available only at one pump in main bazaar. Ask any local for directions. Give attention to timing, the pump starts late in the day and closes around sunset. So fuel up first thing you reach Gwadar.
Give attention to optimum speed to get maximum milage.
Refuel on the way back with Irani before the tank is half.
This way you'll not need carrying extra can. But do carry at least 4L one (lube can is perfect for safety and minimum smell). This is for emergency only. In case you have to use that, do mix with equal Irani fuel to get maximum out of it.
Hope this is helpful
Muzzammil