Willkommen!
Did you chose the CVT on purpose over a manual?
One of my big pet peeves about
regulated fuel economy testing is that it's biased against manual transmissions. These days, CVT ratings appear to exceed the fuel economy of the same car with a manual transmission, but a motivated eco-driver can still beat the CVT in the real world without much difficulty. (And have more fun while doing it!) I would assume the European test also handicaps the manual.
All that said, one of the things I love about CVT's is how much more civilized the highway driving experience is compared to most manuals. Cruising RPM is dramatically lower & more relaxed.