Today on Green Car Reports: Volkswagen promises more-efficient lithium-air batteries, Audi plans more plug-in hybrids, and mass-transit usage grows. All this and more on Green Car Reports.

Volkswagen says it can triple battery capacity with lithium-air technology.

Audi will build plug-in hybrid models of the next A6 and A8 sedans, as well as the Q7 SUV.

The Autolib electric car-sharing service expands into London from Paris.

Growth in mass-transit usage outpaces miles driven in the U.S.

Downsized three-cylinder engines may be all the rage right now, but they're not refined enough for Mercedes-Benz.

London uses smart crosswalks to make streets safer for pedestrians (and drivers).

The 2016 Land Rover Discovery Sport small crossover is caught in spy shots.


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