public override string ToString()
        {
            StringBuilder vehicleStringData = new StringBuilder();

            vehicleStringData.Append(base.ToString() + "\n");
            vehicleStringData.Append(m_FuelData.ToString());

            return(string.Format(vehicleStringData.ToString()));
        }
        public override string ToString()
        {
            StringBuilder vehicleStringData = new StringBuilder();

            vehicleStringData.Append(base.ToString() + "\n");
            vehicleStringData.Append(m_WheelData.ToString() + "\n");
            vehicleStringData.Append(m_FuelData.ToString() + "\n");
            vehicleStringData.Append("Trunk Volume: " + m_TrunkVolume + "\n");
            vehicleStringData.Append("Driving hazardous materials? : " + m_IsDrivingHazardousMaterial);

            return(string.Format(vehicleStringData.ToString()));
        }