efficiency isn't everything.
I'm all for "efficient dynamics" and such, but I don't think I'd want to drive a 4cylinder x6 no matter how much weight they take off the car. I can't imagine this would ever make it anywhere close to production. Upwards of $70k for a four-cylinder 2-ton SUV? That's a tough sell.
There's a limit to how far they can take the "less is more" concept without diminishing the core appeal of the car.
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