Last time I was in Dayton, we went I-40 to US-27. It's pretty flat once you get into TN. I thought there was a big hill down toward Chattanooga, but I'm not finding it on the map. There's a pass on I-24 heading west from Chattanooga, but it looks fairly flat, just twisty. Sort of like going through the I-40 gorge west of Asheville. Edit: found the I-24 hill. It's posted at the top now. Loses 1000ft in 3mi on the EB side.
How did you end up in Keokee?