The range of the plug-in-only Nissan Leaf varies with real-world driving conditions.

Everything is come up roses for the all-electric Nissan Leaf.

The Environmental Protection Agency just named the Leaf best in the midsize vehicle class for fuel efficiency and best for the environment.

The EPA tested the Leaf for an MPGe, or MPG equivalency, rating. After five-cycle tests using varying driving conditions and climate controls, the EPA gave the Leaf a rating of 106 city, 92 highway for a combined 99 MPGe. The EPA's formula of 33.7kW-hrs being equivalent to one gallon of gasoline energy, Nissan said in a press release.

The 99 MPGe rating will be added to the Leaf's pricing and informational label. In addition, the label will display a charging time of 7 hours on a 240V charge, and a driving range of 73 miles

"We're pleased the label clearly demonstrates the Nissan Leaf to be a best-in-class option, reflecting that it's a pure electric vehicle, uses no gas, has no tailpipe and has zero emissions," said Scott Becker, senior vice president, finance and administration, Nissan Americas. "The label provides consumers with a tool to compare alternative-fuel vehicles to those with a traditional internal combustion engine and allows them to make an informed purchase decision."

The Leaf, which will be available in selected states next month, has an MSRP starting at $32,780.