To offset Nissan’s price cuts, Detroit has implemented discounts on some models, such as the Chevrolet Volt plug-in hybrid, and offered promotions
To offset Nissan's price cuts, Detroit has implemented discounts on some models, such as the Chevrolet Volt plug-in hybrid, and offered promotions such as free oil changes.A Chevrolet Volt is charged next to the Renaissance Center, GM's global headquarters, in Detroit this month. (Bloomberg News/by Jeff Kowalsky)