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Coverage boundary. Coverage is a family-level snapshot of major United States passenger-vehicle brands. Model years, trims, drivetrains, battery sizes, body variants, fleets, and special editions are not separate records unless the manufacturer's all-vehicles catalogue presents them as distinct named product lines. Inclusion rule. Maintain the fifteen cited high-volume and comparison-relevant United States manufacturers, and include only passenger-vehicle lines shown on each cited current manufacturer lineup; additions to the brand set require a first-party candidate review. Detailed specifications appear only after fact-level primary-source review.