I said "around 2020", not "by 2020". His prediction was based on projecting technology curves out and comparing to a set of requirements around acceleration (a

I said "around 2020", not "by 2020". His prediction was based on projecting technology curves out and comparing to a set of requirements around acceleration (able to merge onto a highway), range, and cost. Such projections out decades in advance are naturally imprecise. I would have considered it a darned good prediction if the first mass market electric cars had arrived anywhere between 2015 and 2025.