Mileage type tracking is a feature that can be added by following these steps:

1. Access the TMM Store (click here to learn how)
   
2. Scroll down to the "Single Items" section and click on the "Add Mileage Type Tracking" row but if you want to see any discounted bundles that include this add-on then:
   
   
   1. Click the button in the lower left corner to open the store assistant popup
      
   2. Then scroll down to and click the Mileage Type Field row
      
   3. Next click the TMM Store window to close the assistant and return to the filtered store listing
      
   4. Finally click the add-on you are interested in from the bundles or single items section
      
3. Details about the purchase along with screenshots will be provided on the right side of the screen. When you are ready to purchase, click the buy button in the upper right corner of the screen and follow the In-App purchase instruction provided by Apple to complete the purchase.
   
   

Buying this add-on allows you to generate reports with total mileage and total reimbursement for each mileage type.