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Driverless cars are giving engineers a fuel economy headache

Self-driving technology is a huge power drain and will conflict with fuel-economy standards

A Chevrolet Bolt electric vehicle. As major markets from California to China ratchet up pressure to curb pollution, carmakers will have to find creative new ways to offset emissions produced by feeding the car's increasingly intelligent brain.

Mr Musk imagines a future where Tesla owners can rent out their autonomous cars as robotaxis when they're not using them.

New York

JUDGING from General Motors Co's test cars and Elon Musk's predictions, the world is headed toward a future that's both driverless and all-electric. In reality, autonomy and battery power could end up being at odds.

That's because self-driving technology is a huge power...

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