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It's easy to understand that, if you power your vehicle with electricity, you don't need to use as much gasoline. But, how much do you actually save, in terms of fuel costs and greenhouse gas emissions if you plug in instead of gas up?

If you get enough like-minded individuals together, they can accomplish quite a lot. Take, for instance, a group of fans on the MyNissanLeaf forum who wanted a more accurate way to tell how much further they could drive their Nissan Leaf. They accomplished this goal by coding up a device that plugs into the OBD-II diagnostics port and returns the exact state of charge of the battery.