After hitting a five-year peak in 2015, combined sales of the Ford Mustang, Chevrolet Camaro and Dodge Challenger have declined 8.4 percent this year.
So is it time to worry about America's fabled muscle-car troika?
Possibly not, because the decline this year nearly matches the 8.5 percent drop in overall car sales as crossovers and SUVs keep rolling up gains. Yet the cool-down of America's muscle-car mania could have deeper meaning.
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