You will be reimbursed an applicable mileage rate based on the type of POV you actually use (privately owned airplane, privately owned automobile, privately owned motorcycle). These rates will be published in an FTR bulletin and are also displayed on GSA's Web site (http://www.gsa.gov/mileage ).
Code of Federal Regulations
[FTR Amdt. 2010-07, 75 FR 72967, Nov. 29, 2010]