The people of The Mew Motion here in the Netherlands have done a little endurance test with a Nissan Leaf and a Mitsubishi iMiev. The aim was not to get the biggest distance as possible with these electric vehicles, but to see what the range would be under normal conditions. The test was performed at the Dutch racing track at Zandvoort (so perhaps it was not really normal performance, but racing performance instead?).
Check out the video below, they have made it available in English as well and see how both cars perform around the track: