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> That’s a difference of only one one-hundredth of a foot per mile.

Well if we're being pedantic, it's 5280/499999 feet per mile, or 1/499999 feet per foot.

Non-native speaker being curious: do we need to use plural with fractions less than one?

Is it 1/2 foot or 1/2 feet?

Half a foot (or a half foot), but 0.5 feet