It's been another busy week in the green automotive world. Let's take a moment to recap:

Making headlines this week is the new 2015 Ford Mustang. It's the first Mustang to offer a four-cylinder engine option since 1993, and that has some fans excited, others in an uproar.

With November behind us, we took a look at plug-in electric car sales and found the numbers to be down from October. Whether it's a trend that December will follow is yet to be seen, but you can bet we'll keep you updated on the situation.

We sparked a debate this week by discussing whether hydrogen fuel-cell vehicles can compete with electric cars--following our first driving impressions of the new 2015 Hyundai Tucson Fuel Cell crossover.

In Tesla-related news, it seems the cause of the mysterious vampire draw might have been finally discovered. Meanwhile, in Ohio, Tesla beat the car-dealer lobby at the Statehouse.

Its maker cut the price of the 2014 Mitsubishi i-MiEV electric car by $6,130 and added more standard features, and supercar maker Saleen confirmed it's working on an electric car.

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