Hmm, that is not my experience. Our Leaf delivers a full charge in about 4 hours, vs. 5 for the Karma. Or, 18 miles per hour of charge for the Leaf vs. 10 miles of charge per hour for the Karma. I can't give more exact numbers, we haven't had the Leaf long enough, or been paying that close of attention. I suppose, as we have 2 chargers, the charger we use for the Leaf could be faster, but I don't think so.