41 C.F.R. § 301-10.305 How is reimbursement handled if another person(s) travels in a POV with me?
Title 41 - Public Contracts and Property Management
If another employee(s) travels with you on the same trip in the same POV, mileage is payable to only one of you. No deduction will be made from your mileage allowance if other passengers contribute to defraying your expenses.
Title 41: Public Contracts and Property Management
PART 301–10—TRANSPORTATION EXPENSES
Subpart D—Privately Owned Vehicle (POV)
§ 301-10.305 How is reimbursement handled if another person(s) travels in a POV with me?