@Jerry Bransford says those iridium tipped are good for 200,000 miles and really possibly more. I bought 12 because they were so cheap and both the Rubi and the XJ need them.A bit of basic maintenance. I wasn't positive if or when they were done before. They were autolite so I'm assuming I either did them early on in my ownership or the PO did them at some point.
@JMT - Thanks for the link to the new plugs. It was the motivation I needed.
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https://www.amazon.com/dp/B009J39ZI2/?tag=wranglerorg-20