DRIVERLESS cars better be able to refuel themselves. They'll consume more energy than cars with drivers.
That's the somewhat counter-intuitive conclusion in a new study by researchers at the University of Michigan in Ann Arbor. They say that autonomous cars could reverse a years-long trend of declining fuel consumption.
At least a half-dozen car and technology companies, from General Motors to Google, are developing the futuristic vehicles, which would be guided by sensors and satellite positioning. Baidu Inc, the Beijing-based search-engine company, has said it could have a model on the road this year.
Here's how they'd use more energy than conventional cars: more trips. In most households,...