If you do reduce idling time by 60 minutes, it would result in the fuel savings of 2,250 gallons at a cost of almost $7,500 per seasons!
Many fleet fueling programs are going off line along how can other problems. They come in many models and sizes (mid-size vehicles, trucks, etc.). https://online-learning-Initiative.org/wiki/index.php/Gps_Tracking_For_Fleet_Management_-_Common_Questions