So I'll probably have to take this with a grain of salt as Canada is persona non grata with respect to auto parts these days. Maybe someone smarter than me can explain this. Percentage of U.S. and Canadian parts This component employs data from the American Automobile Labeling Act, which has been in effect since 1994 and requires automakers to report the overall percentage of U.S. and Canadian content, by value, for most vehicles they sell. Some automakers report a single percentage per given model sold; others break out unique percentages by powertrain, trim level or assembly location. In such cases, the AMI employs sales-weighted averages for the score. Combining Canadian and U.S. parts content is a flaw we can’t reverse-engineer, but a clear advantage is that unlike other leading systems rating domestic automotive content — e.g., calculations for regional value content under trade agreements or delineations for import versus domestic cars in fuel-economy mandates — the AALA makes this information more legible to the consumer. The act requires automakers disclose this percentage on window stickers or nearby placards for most new vehicles not yet sold (though we’ve come across dealerships that don’t comply). While automakers don’t furnish U.S. versus Canadian parts content and public data don’t exist to distinguish each, we compensate by factoring in engine and transmission origins to more accurately identify two major cost-intensive components of each vehicle.