Park in the shade. Gasoline actually evaporates right out of your tank, and it does so faster when you park directly in the sun - winter or summer. Parking in the shade also keeps it cooler inside, and you will need less A/C to cool off when you get back in. If there is no shade available, park so that your gas tank (the actual tank under the car, not the valve to fill it) is facing away from the direct sun. Also, today's fuel systems are supposed to be airtight. Your gas cap should have a seal in it. Make sure that the seal is keeping the fumes in and outside air out.
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