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govinfo.gov
Although the FAA fee schedule quotes rates per 100 nautical miles, their "calculation" section makes it clear that the exact distance is used. See "§ 187.53 Calculation of overflight fees", Federal Register(PDF), vol. 81 #229, 2016, p. 85854. Note that all an aircraft's fees for a calendar month are waived when they total less than $400.