New York Codes, Rules and Regulations
Title 2 - DEPARTMENT OF AUDIT AND CONTROL
Chapter I - Audit Of Revenues And Accounts Payable From State Funds And Funds Under Its Control
Part 8 - Traveling Expenses
Section 8.6 - Transportation by rental vehicle

Where reimbursement is sought for the expense of using a rental vehicle, the appropriate receipt must be submitted with the travel voucher. Reimbursement will be allowed for a period not to exceed 10 days for rental vehicles used within the State of New York, unless there are monies specifically appropriated or the vehicle is rented pursuant to an OGS lease contract. There is no time limitation on rental vehicles used for out-of-State travel. (See State Finance Law, section 43.)