Pocket Mileage HD (iOS) app for $0.99
Find it is very inconvenience to record your mileage on paper or other apps? Well, Pocket Mileage is for you. There is no easier way to track your mileage.
Just need one entry if you have a round trip. Record your starting odometer when you leave the origin, and the ending odometer when you get back instead of recording it as two different entries.