Advice of Mileage Tracking App or Software

[Scott Dixon]

Putting together all of my tax info for the year and I was reminded of how poor I am at tracking mileage. Very interested if anyone has used any iPhone/Android Apps with success. I am imagining an App which you could click Start when leaving the house and End when returning home and the GPS functionality of the smart phone would do the rest. Then fill in a few more pieces of info and all the mileage could simply be output to a .txt, .csv, or .xls. which I could input into my master excel spreadsheet.

Thanks!