For those with the vacuum, or the hybrid, or don't want to pay for the OEM donut, or want something for when you travel away from civilization... and don't want to take up space in the trunk... you could mount a spare to the hitch.
Personally I'd rather strap it to a cargo carrier, which has more practical uses than just a tire, but thought I'd add this as an idea/option.
2017 Gas Touring L, Curt hitch, 13" aftermarket overhead screen
2018 Limited PacHy, Curt hitch, Weathertech, B1W hardwired dashcam
2019 Limited S PacHy, Drawtite hitch, Weathertech, B1W hardwired dashcam