Thought i would post this for the many that dont have a tethered gas cap. Last thing you need is a misplaced gas cap or one that rolls under a passing car at the gas station. Happens quite often if you live in the windy city ;)
(Sorry, having issues loading pics)
Found one at Napa auto parts for $18. Ebay and other places might have it for much cheaper.
Napa part number #703-1895
https://www.napaonline.com/en/p/BK_7031895
Hope some find this useful, good luck!