Avis typically requires that customers return their rental car with a full tank of gas. This policy is in place to ensure that the next customer receives the vehicle with the same fuel level as when it was picked up. If the vehicle is returned with less fuel, Avis may charge a refueling fee, which often exceeds the cost of refilling the tank at a local gas station. Therefore, it is advisable to fill the tank before returning the vehicle to avoid any additional charges. If for any reason a customer is unable to return the vehicle with a full tank, it is best to consult the terms and conditions outlined in the rental agreement. Additional details regarding fuel policies may also be found on the Avis website for the most accurate and current information.