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Wednesdays are best day to fill 'er up

Need to fill up the gas tank?

If you live in South Dakota, you might want to wait until Wednesday.

Midweek is the cheapest day to fill up in South Dakota, according to a recent study by

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Taking a weekend trip to Minneapolis, Minn.? You're in luck. GasBuddy says the weekend is the cheapest time to purchase gasoline in the Gopher State.

Weekends are the cheapest for most states, GasBuddy found, but some states like South Dakota had lowest prices on weekdays.

South Dakota was also one of the few states to have a consistent day of the week from 2010 to 2013 — Wednesday — to purchase gasoline. Wednesday was the cheapest day in 2010-12, with Saturday breaking the trend in 2013.