I take a trip every weekend from lhr to rwp and back. So mostly I fill from Hascol Motorway. Quality and Quantity wise they are the best. Plus there rate is also bit lower then what is being charged in RWP.
In RWP Total pump in Jhanda Chichi (where musharaf was attacked) is very good both quality and quantity wise. I happen to know the owner since we share the same mechanic, he is a very honest and humble guy a retired army officer.