Are you self-employed or a small business? Do you use your personal vehicle for business purposes.
Check out this Ultimate Tax Guide to Mileage Deductions in the U.S. by MileIQ. A great overview of the importance of tracking your mileage if you plan on taking the deduction at tax time. If you decide to purchase the MileIQ app for automatic tracking and calculation, be sure to see my promo code on the last page and save 20% off your purchase, ultimate-guide to Mileage Deductions