I will not even try to write this post in German.......
I have been following a discussion on a UK forum about an available update of the ECU (Engine control unit) of the Niro.
Here is what one member wrote yesterday:
Thought you would like to know I have taken my Niro 3 in last week for the update.
I went in because I detected a slight hesitation on the overrun when the petrol engine was running. Nothing major, you understand, but annoying. The car has done 1300 miles.
Went into Loughborough Kia, I explained the problem and they looked the car up on the data base and sure enough it needed an update. “Have a cup of coffee and we will do it now”, they said.
By the time I had a chance to drink the coffee, and chat to the friendly staff, the car was ready.
The update has got rid of the hesitation, and interestingly it has improved the MPG on the readout by about 1 MPG
http://www.kiaownersclub.co.uk/forum/niro-ecu-update_topic34257_page2.html
Has anyone noticed those problems - "a slight hesitation on the overrun when the petrol engine was running"? and has anyone talked about this with the seller?
I think that I have noticed it when the gear changed after the petrol engine started...... hesitation is the word..... 
My seller is to far away for me to just drop in and discuss this. I need more info!
)