1. Detailed and to the point instructions on how to record mileage and vehicle expenses. Understand how to log the information. Easy to understand descriptions for Business, Charity, Medical and Moving mileage. Created by a Certified Public Accountant. 2. Effective back up for your mileage deduction or actual expense deduction. The IRS requires accurate recordkeeping for tax deductions. If the information is incomplete, for instance the business purpose is absent, the mileage deduction may be disallowed during an audit.3. 1, 300 lines to record business mileage. Bonus pages to enter medical and charity mileage. Pages to enter direct expenses; like parking, fuel and vehicle maintenance. 4. Handy size for keeping the vehicle glovebox. It's important to use a convenient size; a bulky or unwieldy logbook is less likely to be kept in the car.1. Detailed and to the point instructions on how to record mileage and vehicle expenses.