Abstract: A system and method for sub-renting a vehicle to a secondary/sub-renter after the vehicle has been rented to a primary renter. The vehicle may comprise a telematics control unit to enhance the sub-renting process. A rental duration of secondary renter(s) may be compared to an idle timeframe specified by the primary renter. Other rental parameters may be compared to enhance sub-renting of the vehicle, such as an idle location and a vehicle class of the vehicle, for example. In this manner, rented vehicles can be utilized more, particularly during periods when the primary renter has no need to use the rented vehicle. Secondary renters are enabled to use/rent the vehicle during these idle periods and the primary renter can avoid paying for more than he or she needs.