U.S. auto executives now worry that proposals floated ahead of talks with Mexican trade officials next month could raise operational costs even further

Mexico's proposal would apply U.S. tariffs only to non-North American vehicle content, potentially lowering the effective rate to 5% or 10%

Atualmente, as montadoras americanas enfrentam tarifas de cerca de 25% sobre importações provenientes do México e do Canadá, mas veículos com maior proporção de conteúdo produzido…