UPDATED: The best I have found - 5 stars again!

7/4/15 update: This app works again! The newest update fixes the issues listed in my prior review. Plus, somehow the developer has found a way for it to use FAR less of my batterys life than before. I can now leave it running all day without my phone going dead.
I had been using another mileage tracking app, but sometimes I would forget to start it, and other times it wouldnt record my trips. After a few days of testing, Auto Miles has tracked every trip I made. It also captured one that the other tracking app missed!
I again love this app for its simplicity and great reporting. Thank you for listening and fixing the issues with your great app.

3/17 update: iOS 8.2 seems to be confusing the app. It now takes hours for the app to record a trip. It also will log trips when I am not traveling. It logged a 3 hour 0.1 mile trip the other day while my phone was lying on a table. I loved the app until the iOS 8.2 update. 5 stars when this gets sorted out.

Original review: I looked at a number of mileage tracking apps, this is the best one I found. Some dont work at all, some want an expensive annual fee. AutoMiles is fairly priced and it works.

Chops Fisher about Magical Miles - Automatic Mileage Log and Auto Mile Tracker for Tracking Every Deduction and Expense