Audi A7 h-tron flirts with performance fuel-cells

The LA Auto Show 2014 is shaping up to be the car show where fuel-cells come to the fore, with the new Audi A7 Sportback h-tron quattro joining Toyota's Mirai and Honda's FCV in turning to hydrogen for its power. Officially a plug-in hybrid + fuel-cell electric car, as Audi would have it, the A7 Sportback h-tron quattro concept delivers …