301-10.310—What will I be reimbursed if I am authorized to use a Government owned automobile and I use a privately owned automobile instead?
You will be reimbursed based on a constructive mileage rate limited to the cost that would be incurred for use of a Government automobile. This rate will be published in an FTR bulletin available at http://www.gsa.gov/ftr. If your agency determines the cost of providing a GOA would be higher because of unusual circumstances, it may allow reimbursement not to exceed the mileage rate for a POA. In addition, you may be reimbursed other allowable expenses as provided in § 301-10.304.