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7-Eleven spokesperson Margaret Chabris said the 64-ounce cups were simply too large to fit in the cupholders of most American vehicles.
"It was a request for something that was a little more car-friendly," Chabris told the news outlet. She added that sales of the 50-ounce Double Gulp are now the fastest growing of 7-Eleven's cup sizes.
"If it didn't sell, we wouldn't still be carrying it," Chabris said.