Like many business folks, I use my car for both business and personal use. You could even say I live in my car. And tracking milage for business purposes is important. MileIQ is an amazing applications for your smartphone. The developers made it simple for you to track your mileage. It allows you to generate a simple mileage expense report so you can take advantage of the tax breaks and any other reimbursements for the mileage you've incurred while using your vehicle for business purposes.