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A Troy, MI-based company is selling a system for Nissan Leafs that could add an additional 40 miles of range to the battery-electric car thanks to the installation of an additional lithium-ion battery, Green Car Reports says.

We'll start with the numbers: $1,995 will get you a 2 kWh plug-in battery pack for your second-generation Toyota Prius; $2,995 will get you a 4 kWh pack (the installation feel and the $95 delivery charge are extra). For your two or three grand, you can reach "the holy grail of achieving 100 mpg."