Open but stashed away for 6 years

Wired reports

Volkswagen's had its super-thrifty One-Liter Car concept vehicle -- so named because that's how much fuel it needs to go 100 kilometers -- stashed away for six years.

Makes one wonder what other technological advances are being conveniently withheld?

Six years? What were they waiting for?
$4.00 per gallon gasoline?

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