We're not talking about basing a purchase decision on market share numbers or how many iPhones people bought. You claimed Detroit had lost "lots of market share" to the imports, specifically Toyota and Nissan, and the figures don't lie. They haven't lost "lots" of market share. Ford sold 763,402 F-series pickups last year. Toyota sold about 272,000 (Tundra and Tacoma), Nissan sold about 79,000 (Titan and Frontier).
Detroit trucks account for 93% of the light truck market.