Just purchased an i3 and was curious about the efficiency of Level 1 vs Level 2 charging - when I just needed to top off the charge and I knew either level would do the job overnight.
I discovered this link:
http://www.veic.org/documents/default-source/resources/reports/an-assessment-of-level-1-and-level-2-electric-vehicle-charging-efficiency.pdf
I appears Level 2 is a bit more efficient
I discovered this link:
http://www.veic.org/documents/default-source/resources/reports/an-assessment-of-level-1-and-level-2-electric-vehicle-charging-efficiency.pdf
I appears Level 2 is a bit more efficient