I took a bit of a waste trip on the highway as the store was closed when i got there, but that is a different story. On the way back I found the engine on my KIA likes to do some strange decisions. The highway has a section that goes through a small valley. I am driving at around 110kph/70mph and the engine is ticking over at about the 5.4L/100km .. and you can tell it's in top gear from the sound. I go down a hill and the engine turns off and switches into EV mode. All is good. on the flat bit after the decline, the engine turns back on and in top gear running again at 5.4L/100km. Then on going back up the hill on the other side the engine still stays in top gear and allowing it to scrub off a bit of speed to say 100kph stays at the 5.4L/100. but when I get to the top of the hill and the road levels off (so you are no longer going up a hill) the engine then decided to drop a gear, jumps to 10~11L/100km, and will stay locked in way until you press down on the gas to bring the speed of the car up to say 115kpg then take your foot totally off the gas allowing the car to go into regen mode for 4-5 seconds, then the car will run normally and allow itself to go back into top gear and the engine fuel usage drops back to the 5.4L/100km. Otherwise, it will just stay in a dropped gear state.
It only does this if you go down into a valley, so down one hill, then shortly back up the other side. If you go up a hill without going down one first, it seems to work fine. I just don't understand the logic in the processor. Now I have only had the car for 4 months now, so it might be a winter temp thing? I don't know until I get to summer and it also hasn't had its first oil change so who knows if something setup wise is still amiss.
2018 Niro EX - Ocean Blue
GTA - Canada.