However most customers at self-serve stations take a lot of time compared to a high-volume station's practised attendant. Can you turn the whole enter grade, amount, unscrew fuel cap, place fuel cap someplace, remove nozzle, insert nozzle in tank, hold the trigger, fill, remove nozzle, replace nozzle on pump, find gas cap, screw on gas cap, shut fuel door, and settle payment, count change in under 100 seconds?
The nozzles I've seen used in self-serve are smaller and pump slower than those used in attended stations.
You have GOT to be kidding!
In a self-serve station, I don't have to wait for the attendant to come to the door, nor do I have to wait for the attendant to receive payment. I just insert the card into the pump, pay, and pump. Not exactly a highly-skilled technical job!
And do it for about six cars at the same time + wash the windshield.