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There's also the Audi RS6 Avant, a good option for anyone interested in spending $160K on a station wagon with 621 horsepower.

Oh, that beats out the AMG E-series wagon by 18 HP!

That's fair, but the wagon should still outperform an equivalent cross-over in just about any measure.

What I don't know is where the line is between car-based cross-over and actual truck (as it related to emissions and safety standards).

There's an envelope, rather than a single line, but one line that makes up that envelope is AWD, such that some models without optional AWD are cars, but trucks with optional AWD

> Wagons are [...] less aerodynamic than sedans.

* Wunibald Kamm has entered the chat.