You will really want to keep track of your miles as the standard rate for 2015 was up to 57.5 cents per mile !! And, now for 2016, the new rate is .54 cents per mile.
I use the TripLog App on my Android phone to track my miles. It has a great interface, and the ability to print reports, too. There’s a free version as well as a paid version (only $9.99 per year).
What methods do YOU use to track your miles?