That's certainly a very European thing to ask about fuel economy before anything else. Obviously, the extremely high taxes on gas forces them to think this way, but it's apples to oranges comparing a full-size American SUV with a 5.7L V8 in the U.S. to a compact European hatchback with a 1.2L L4 in Germany.
Not really... the 1.2L L4 brought them from their residence to the airport, the 5.7L V8 from the airport to the residence. They did basically the same job....