Costco extended gas station hours and opened new gas stations earlier this year. The result became a boon for the warehouse retailer.

CEO Ron Vachris said during Costco’s third-quarter earnings call last week that the company saw "two of our all-time highest gallon weeks" in the U.S. in April.

That, according to the Costco CEO, was due to a "combination of expanded gas station hours, new gas station openings and lower prices at the pump ."

The warehouse retailer lengthened the hours at its North American gas stations a few months ago.

In a mid-February Facebook post, Costco listed the new gas station hours of 6 a.m. to 10 p.m. on Monday through Friday, 6 a.m. to 8:30 p.m. on Saturday and 6 a.m. to 7:30 p.m. on Sunday, though it said they could vary for California and Hawaii.

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