So you want a more aerodynamic leaf and you have a 2013 laying around and an insight..... lets mash them up!!!
http://ecomodder.com/forum/showthread.p ... 30966.html
CdA from 6.94 to 5.10, weight down by approx. 1000lbs. Smaller tires so less top speed but quicker acceleration. Also narrow and if Bridgestone RE92s one of the lowest rolling resistance tires available. Wheel tire combo is super light too.