I looked up the range of the Nissan Leaf, they say it can go 62 miles in terrible conditions: 14 degrees F outside, traffic jam, average speed of 15mph (it's most efficient speed is 38mph). That's slightly worse than half their best condition 138 miles: flat roads, 68d F, 38mph constant speed. (http://www.nissanusa.com/leaf-electric-car/tags/show/range#/leaf-electric-car/theBasicsRange/index)
If Toyota is playing it safe and reporting their worst condition distance for now, then all is well. If they reported the distance it could go according to the EPA standard "LA4" test, then it might still get 30 miles in worst conditions.