I noticed this trend a few years ago but I can say everything I have (Accept for our bigger 14k business trucks) with tires has a spare because you don't know the value of one until you need it. This is also about more than MPG & weight, because a spare & mounting hardware isn't free so the car manufactures are saving lots of $$$$s also.
I just purchased a new Tandem Utility trailer & paid extra for a mounted Spare.
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