The Chevrolet Bolt EV sees only minor updates for 2019, and continues with a 238-mile range on a charge. The biggest change, however, involves the $7,500 federal tax credit granted to electric vehicle buyers. Because General Motors reached 200,000 plug-in vehicle sales late last year (including the Volt plug-in hybrid), the Bolt EV’s credit will phase out beh\ginning this spring, It will drop to $3,750 on April 1, be reduced to $1,875 on October 1, and eliminated altogether on March 31, 2020.