Turns out it works pretty much the same as the old gas cap, but without the handy plastic tether that the original Toyota cap attached to the Prius. Both seem to loosen up after a few days so I just tighten them every few days. If you drive a Prius, you know it can be a week between trips to the gas station where you unscrew the cap after adding gas to the tank. So I just drag it every few days and it's ok.
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