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There's no indication that Audi plans to sell the A7 h-tron — it's billed as a technology demonstrator, just as many of Audi's e-tron EVs have been — but the company says it can make hydrogen cars should the...
Audi says it has 'mastered' hydrogen fuel cells and is ready to launch them
A hydrogen version of the A7 will go over 300 miles on a tank
http://www.theverge.com/2014/11/19/7247281/audi-says-it-has-mastered-hydrogen-fuel-cells-and-is-ready-to-launch