Use a mileage reimbursement to reimburse mileage when using a personal vehicle for Duke-related business. Users must submit mileage reimbursements on a travel expense report. Users can create their expense report using the Google Maps mileage calculator in Concur or by creating a log that outlines mileage and attaching it to the expense report. Steps 1-9 in this guide outline how to use the Mileage Calculator. Begin reading at Step 10 when using a mileage log.