Seems like around here (SF South Bay) I've had to refill the windshield washer reservoir at least twice a year. And I don't use a funnel
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edit: Oh, and to keep the thread on topic.... going against factory recommendations, I've been using this for the last couple of months:
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It does streak a little bit while the wipers are, well, wiping. But they go away in a few seconds as the onrushing air evaporates the fluid. I've not noticed the "beading" element as it's been forever since we had any rain. I figure that the +32F limitation isn't going to be a problem as I don't plan on driving anywhere that cold for the next several months. By that time I should be done with this gallon and probably going back to the standard blue (cheap) all-weather stuff.