These days I don't. The El Cheapo stations I pass have the lowest price for cash, so I stick a $20 bill in the reader. That's something over half a tank, and generally lasts 3 weeks to a month. (Honda Insight, 70+ mpg :-))
But in the days when I did, I'd just stick the nozzle in on the lowest notch, leave it while I washed the windows, and let it click off.
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