From his apartment, Kona drives 9 miles to the bakery.  From there, he drives 24 miles to his grandmother’s house.  From her house, he drives 27 miles straight to his apartment.  How many additional miles did Kona drive round trip to the bakery stop, compared to a round trip without the bakery stop?
With the bakery stop, Kona drove a total of 9 + 24 + 27 = <<9+24+27=60>>60 miles.
Without the bakery stop, Kona drove a total of 27 + 27 = <<27+27=54>>54 miles.
With the bakery stop, Kona drives an additional 60 - 54 = <<60-54=6>>6 miles.
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