For all the examples provided, you'd need to make sure the dynamic fields / contact details mentioning this info are setup properly in your automated emails. You'd then need to regularly edit your contacts, and their respective custom fields for mileage, to accommodate the new estimates for when the automation sends out.
You can either edit a contact on an individual basis, or upload a file to overwrite / update certain contact fields (such as a custom field for mileage).
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