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The fuel-sipping cars have been unprofitable, but technological advances are changing that.
Delphi says its diesel-like engine runs cleanly on gasoline.
Sensor technologies once limited to luxury cars are increasingly available in the mass market.
The advanced fuel cell could eliminate range anxiety and make electric cars more practical, while keeping carbon-dioxide emissions low.
Alternative approaches replace the battery with compressed air or a flywheel.
Researchers beat automatic locking and ignition systems.
A hydraulic hybrid technology lets trucks burn a third less fuel than they normally would.
Interconnected computer systems provide openings for attackers.
Networking sensors attached to taxis could ease the hunt for street parking.
A researcher claims that toll transponders can be cloned, allowing drivers to pass for free.