For folks who aren’t familiar with the recently coined measurement, MPGe stands for miles per gallon gasoline equivalent. It’s supposed to translate the energy consumption of alternative-fuel vehicles into relatable terms.
At a more granular level, the i (previously known as the i-MiEV) is more fuel efficient in the city than on the highway; the same is true for the Leaf. The i gets 126 MPGe in the city and 99 MPGe on the highway. Real-world electric range is estimated at 62 miles, more than 10 miles less than the Leaf, the EPA says.
Since the Mitsubishi i is significantly smaller than the Leaf, the latter remains the most environmentally friendly midsize car.
The Mitsubishi i goes on sale in select markets this fall, with a starting price of $27,990 before federal tax breaks. A nationwide rollout is scheduled for November 2012.