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It's been discussed before, but it's been a while. You're not going to see any improvement in fuel economy unless you're exclusively in stop and go traffic.
In my view, if you need the extra space, then ditch the spare tire. Otherwise, you might as well leave it in.
I consider tire plugs to be a permanent fix, and capable of fixing ~90% of tire "incidents". My preference is to plug even when a spare is available.
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