Bad assumption, it does not use the C Class engine.assuming the mercedes benz CLA 250 wil use the same engine as the 2013 C250, it should be a bit better than what the C250 is rated at being 22 City, 31 Highway.
Converted those gas mileage numbers to MPG's from l/100 for the American's!.....Official estimations from the Mercedes Benz De website
CLA 180 Blue
I was looking at the 2013 Mercedes B-Class after viewing another thread and came across the official gas mileage number as:I wonder why the B250 is rated at almost 8L where as the Mercedes site shows the CLA250 at 6.1 combined.
Is 8L /100km for freeway only?