The most fuel efficient vehicles - Spritmonitor.de
Spritmonitor's top 100 list.
Some traslation for the US marked: Yaris hybrid = Prius C
Interesting to see that some of the clones are better htan the original, for instance Seat Mii is better that the VW-UP , but it's the same car with small changes. Also the Nissan PIXO is better than the Suzuki Alto, but again - same car with some changes to the front.
Could be some Areo, or the fact that buyers of the clones are more aware of economics, and therefor drive slower that buyers of the originals?
Anyway - the list is food for thought.... This is real drivning in everyday conditions, best and worst quater taken out.