Decide how often you are going to capture the odometer reading on your trucks. Choose an interval you will be 100% successful with. The start of each day, the start of each week, the first day of each month, whatever you decide. Just be consistent so your reports will be too. To enter the odometer reading go to Lists, Trucks, double click on the specific truck you are entering and click truck mileage record. Enter the mileage in the truck mileage field and put the date in and click add.
Each time a repair or maintenance is performed enter it in the maintenance record by going to Lists, Trucks, double click on the specific truck you are entering and click Maintenance Record.