Commuting expense is the cost of one round trip between the residence and Official Headquarters. Travelers may not be reimbursed for commuting expenses.
Example: A traveler works on campus in Kirksville and travels back and forth from his or her home in Macon each day. This round trip between Kirksville and Macon is considered commuting expense and would not be reimbursable as business mileage.
Example: A traveler lives in and is stationed in St. Louis and they do not have an office in that location; therefore the Official Headquarters for that individual is considered his or her St Louis home. Driving from home in St. Louis to the business travel destination in St. Louis would be reimbursable as business mileage.