"Pony car" encompasses muscle cars and their entry level/rental grade counterparts.
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Tellingly, while most pony cars were available with more powerful engines and performance packages—enough to propel some into the muscle car realm—the vast majority were sold with six-cylinder engines or ordinary V8s. The initial pony cars "were sporty compact cars for the masses." They transformed into performance cars for enthusiasts whose production viability depended on significant sales of economical "secretaries' cars" and low-margin rental fleet models.
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https://en.m.wikipedia.org/wiki/Pony_car