I only found out about this a couple years ago. I wonder how many of you didn’t know this:
If you look at your gas gauge, you will see a small icon of a gas pump. The handle of the gas pump will extend out on either the left or right side of the pump. If your tank is on the left, the handle will be on the left. If your tank is on the right, the handle will be on the right (see photo below). It is that simple!