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2012 Mitsubishi i Estimates Range Better Than Nissan Leaf

We’ve reported extensively on our 2011 Nissan Leaf electric car’s main weakness: predicting its own range. So when we received for evaluation a 2012 Mitsubishi i, we wondered how it would compare.

The i, also known as the i-MiEV, is the new most affordable electric vehicle in the U.S., priced at $29,125 before incentives. We expected it to stumble, as the Leaf does, over the many variables an EV faces in trying to predict its range. We were wrong.

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Using the same formula we developed for the Leaf, we analyzed all the trips we took in the i over the course of a week, comparing the actual miles traveled with the projected range at the beginning and end of the trip. Some trips were longer than others, and some started with a full battery while others didn’t. We did not run the battery all the way out.

To get the accuracy percentage, we subtract the number of miles driven on a trip from the EV’s initial predicted range, and then we divide that number into the miles of predicted range remaining at the end of the trip. Percentages below 100 mean the car overestimated its range for that trip, and percentages above 100 mean the car went farther than predicted.

The accuracy for the Mitsubishi averaged out to 100.3%. The Leaf’s accuracy was 86% over the course of a month in October 2011.

To be clear, there are always deviations among the trips. The best individual “score” for the Mitsubishi was 102%, meaning for that trip that it traveled slightly farther than expected given the range estimator’s starting projection. The car’s greatest overestimation for a unique trip was 147%, and its worst accuracy was 62%.
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