The funny part is these things get crap mileage for their size.
They do get crap mileage — now. We’ve had the European version in Canada for a few years & it came with a diesel engine that got much better mileage (naturally). Mercedes changed the design for the U.S. market — the car’s now about 8” longer than it used to be, and only comes with a gas engine (at least in N. America). It’s about time for the U.S. consumer to start demanding diesel engines (in all cars). That way, the rest of us would be able to get them too.