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WIth four-figure sales for both its all-electric Chevrolet Bolt EV and the Chevy Volt plug-in hybrid, GM probably led April's plug-in electric car sales. The "probably" comes because Tesla refuses to release its deliveries broken down either by month or by country, meaning there's no data to compare. GM's 3,102 deliveries—1,807 Volts, 1,292...