Royal Oak — Even on their days off, the engineers creating the Chevrolet Volt are working.

They’re testing, measuring and evaluating what is arguably the most important vehicle in General Motors Co.’s history. They take their work home with them, literally, commuting in the vehicles, strapping baby seats in the back or picking up groceries.

When the official auto show season kicks off next month in Los Angeles, the Volt will play a starring role. On Monday, at Athens Coney Island, a group of Volt engineers talked about the car and how its development is progressing.

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