How to get the yearly mileage and monthly avg from odometer only [Closed]

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Wednesday August 23, 2017
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September 13, 2017
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How can I get excel to calculate the yearly mileage and monthly avg by just monthly odometer readings?

I Here is my worksheet:
https://www.dropbox.com/s/gs5dzetcrfeauvn/Average%20Miles.xlsx?dl=0