mileage log in mi instead of $.

okay I have two problems. I have milage daily log spreadsheet and instead of dollars ($) sysmbol I want the cell to read (mi) for mileage.
My second problem is when my spreadsheet is blank i get #value! I want the cell to read Total. I have attached my mileage log spreadsheet to show what i mean. Any help or improvements would be great. For some reason you cant attach xls attachments so i changed it to .doc. change to .xls before opening. thanks.