What’s the use of electric cars? To go green without the need of conventional fuel, or at least getting more miles out of the fuel with assists from electric motors on the wheels. Common sedans and hatchbacks get around 30 mpg (miles per gallon), while some cars will manage over 40 mpg, which is a rare sight. Hyundai promises that all their lineup of cars will have minimum of 40 mpg soon. But now, Nissan Leaf has received the official EPA stickers with a 99 mpg smile. That’s breaks down into 106 in city and 92 for highway.

The Nissan Leaf is the first vehicle to get this new label, and puts it way ahead of any cars claimed to be the ‘most fuel efficient’. EPA estimated that your annual electric cost would be something around $561 for that car, in the US. You might be spending more in your bills, but at least you’re doing the world a favor by using less fuel, thus reducing pollution (that’s only if your electricity source is also environment friendly).

So, how does the EPA calculate mpg for an electric car? Nissan’s presser says the EPA uses a formula where 33.7 kWhs are equivalent to one gallon of gasoline energy. Also, the EPA determined the Leaf’s efficiency is 3.4 miles per kWh, another number you can easily beat while driving, as the driver info screen can prove. Since the Leaf has a 24 kWh battery pack and can go, officially, 73 miles, then, the EPA says, it could theoretically go 99 miles if it had a 33.7 kWh pack (and everything else about the car remained the same).