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By Alice Gibbs
Senior Reporter
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A new map reveals that the day drivers choose to fill up can make a measurable difference in how much they pay at the pump, with clear patterns emerging across every U.S. state.
According to an analysis by GasBuddy, Sundays are typically the cheapest day to buy gas in most states, while midweek days—most often Wednesday or Thursday—tend to be the most expensive.
Despite a prediction that gas prices are set to drop in 2026, costs continue to fluctuate in response to oil markets, taxes and seasonal demand, GasBuddy says weekly pricing patterns remain surprisingly consistent.
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In many states, prices gradually rise through the workweek before easing into the weekend, creating a predictable window where motorists can save simply by adjusting the timing of their fill‑up.
GasBuddy estimates that buying gas on the lowest‑priced weekday instead of the most expensive one can save drivers between 4 and 9 cents per gallon.
“Gas prices don’t just move based on global oil markets—they also follow a weekly rhythm,” Patrick De Haan, head of petroleum analysis at GasBuddy, said. “For most drivers, Sunday is the safest bet for finding lower prices, while filling up mid‑week can mean paying more.”
GasBuddy analyzed daily statewide average gasoline prices over the past year and normalized prices within each week to identify consistent weekday pricing patterns independent of seasonal trends.
The analysis compared the typical difference between each state’s cheapest and most expensive days to show how timing alone can affect what drivers pay. The estimated savings do not include additional discounts from shopping around or programs such as Pay with GasBuddy+.
The data revealed that Sunday is the cheapest day to buy gas in the majority of states, including large markets such as California, Texas, Florida and New York.
In contrast, Wednesday is the most expensive day in many states across the South and Midwest, while Thursday tends to be the priciest option in parts of the Northeast and on the West Coast. A smaller number of states, including Kansas, Pennsylvania and Wyoming, stand out as exceptions, where Saturdays are typically the cheapest day to fill up.
GasBuddy's data comes at a time when gas prices are expected to rise again in certain parts of the country, particularly in California, which consistently records the highest gas prices in the country. California’s average gas prices are significantly higher than the national average, driven by factors including higher taxes, stricter environmental regulations, limited refinery capacity and the state’s reliance on a special gasoline blend that is more expensive to produce.
While those structural factors may push baseline prices higher, GasBuddy’s analysis suggests that weekly pricing patterns still apply, meaning California drivers may still reduce costs by avoiding the most expensive days of the week—even if overall prices remain elevated compared with other states.
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