In the Swedish KIA-forum I am a member of, a Niro taxi owner/driver has given us his experiences with his car so far.
Kör kia niro som taxi i Stockholm - KiaCarClub
If your Swedish isn´t what it used to be, I´ll tell you what he writes. 
On the whole he is very satisfied with the Niro and in the 25000 km he has driven so far, the consumption has been around 4,5 to 5 l /100 km, no matter what conditions he has driven in.
Since he got the Niro, the temperatures haven´t gone over +5C in Stockholm and he believes that his figures might go down, when the temperatures rises.
His customers often believes that they are going in a "very expensive car". "It is as silent as a premium car" and "the comfort in the back seat is better than in a lot of other cars" are some of the comments the customers have given him.
He also comments on the Niros ability to handle the snow chaos in Stockholm and he finds it extremely good and shares a video on that:
http://tinyurl.com/zamvray
His comment to the video: only an "über driver" can reach his goal today 
He has had some trouble with the 12V battery though (a problem some of us here have commented on before):
"Somehow I have managed to drain the battery and couldn't start the car."
His conclusion is that he often has his car idling with the stereo, ACC and lights on.
My comment to this is that the 12V battery issue has to be taken very seriously by KIA. If not it could ruin KIAs reputation a lot!
