From 2010 to 2014, U.S. electric car sales surged from almost nothing to about 120,000 per year. But the haters and doubters persist. Analysts and investing forums are buzzing about a coming stagnation. After all, in the past seven months the price of oil has collapsed from $115 a barrel to below $50. Gasoline prices have plummeted, too, fast approaching $2 per gallon nationally, and commuters are rejoicing. That means a key selling point for electric vehicles — low fuel costs — is gone.