Speaking at the Barron’s Investment Conference last week, Tesla CEO Elon Musk predicted EVs would be good for 500 miles per charge by 2025. According to Green Car Reports, Musk believed such vehicles would be possible in 10 years, but tempered those expectations by cautioning that more assembly and battery production facilities would be needed to realize that future. At present, smaller lithium-ion cells have fallen in production costs at an average of 7 percent each year since the early 1990s.