Leaving Day. We made our way out of Atlanta, through Chattanooga to the KOA in Manchester, Tennessee, arriving at 5:45 pm Central time. Four hours driving time. After crossing the Tennessee River, the RV had to pull us and the Colorado over the ridge. The GPS showed us climbing to 1,972 feet before dropping back to around 700 feet elevation. Very poor gas mileage today. It was my first visit to a KOA.