As per my experience,
No. 1 is Shell-Model town (linking with Ferozpur road near Kalma Chok). This is ISO Certified petrol pump and petrol quality is reasonable. Not quantity, but only Quality.
No. 2 is PSO in-front of UET Gate-3. This pump do not have good quality petrol frankly. Just its famous because of its Quantity. This PSO pump’s “Quantity of Petrol” is good perhaps all over in Lahore.
No. 3 is Shell-Mughal Pura. Quantity wise they are OK. Quality wise just reasonable. But yet its better than hundreds of other PSO, Shell, Total, Caltex etc. pumps in Lahore.
As many people here suggested Total Garden town. Since now I will start using this and will compare its Quality & Quantity with others.