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I think it's kind of a hybrid of explanations and circumstances. There happen to have been 5 previous Grand Am generations, hence G6. There were also 7 Grand Prix generations, making for the G8. However, the AFAIK the G5 and G3 (and the G2 sold in Mexico) don't correspond to prior model generations; it just seems to have transistioned into a corrolation with the size of the car :3stooges: