Thought it would be worthwhile to explore progress and get opinions, in the battery efficiency and cost space, to project how long it will take Tesla to produce a 400 Mile Range EV..maybe with a Model 3 , which I expect will be the best candidate to get there fastest. If Elon thinks a 500 mile range Tesla is within reach in a decade, could a 400 mile range happen by year end 2020... I.e. within 5 years ? I believe Elon and JB are focused on getting the range to 400 miles with a Model 3, pretty darn fast. Why ? Because not only would it be a huge competitive advantage, BUT it would be go a very long way to solving the range anxiety issue ! Even 350 mile range, for that matter, would be quite a boost, if doable by year end 2018.