The Sierra receives the smallest of changes for 2018. The eAssist package is now available nationwide after being sold exclusively in California since 2016. This system, which GM calls “mild hybrid,” uses a single electric motor and doesn’t operate as a typical hybrid, meaning it doesn’t power the truck on its own. The lineup adds two new exterior colors—Deep Mahogany Metallic and Red Quartz Tintcoat. Every model now has a backup camera—per a government mandate—and the tire-pressure-monitoring system now has an audible alert when you’re adding air, to indicate when the tire is inflated to the recommended level. The base 1SA trim scraps the outdated 4.2-inch non-touchscreen display for a standard 7.0-inch IntelliLink touchscreen with Apple CarPlay and Android Auto.
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