Why you should fill up on gas on Monday mornings (and never on Friday afternoons)

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Want to save money at the pump? Fill up on Monday morning on your way to work.

That's the advice of GasBuddy, the fuel-savings app that tracks real-time data from more than 150,000 gas stations throughout the country.

In a study provided exclusively to USA TODAY, GasBuddy assessed the best day to fill up and the worst day to fill up nationwide and in each state.

While Monday is the best day on average nationwide to fill up, Friday is the worst day. (Scroll down to see state-by-state details on the best and worst time to get fuel.)

"Very early in the week, when gas stations are generally a little bit quieter traffic-wise, is a great time to fill up," said Patrick DeHaan, head of petroleum analysis for GasBuddy. "We generally see more volatility and higher prices later in the week."

On Mondays, some prices tick upward in the afternoon, so it's often a good idea to fill up in the morning. On Fridays, prices often spike in part because some stations are seeking to make more money ahead of weekend trips.

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The best day to buy gas, by state:

Monday: Alaska, Arizona, California, Colorado, Connecticut, District of Columbia, Florida, Idaho, Illinois, Indiana, Kentucky, Maine, Massachusetts, Michigan, Montana, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Dakota, Oregon, Rhode Island, South Carolina, South Dakota, Vermont, Virginia, Washington, West Virginia, Wyoming

Tuesday: Alabama, Arkansas, Delaware, Georgia, Iowa, Kansas, Louisiana, Maryland, Minnesota, Mississippi, Missouri, Nebraska, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, Wisconsin

Wednesday: Hawaii

Sunday: Utah

Read more: https://www.freep.com/story/money/2019/04/09/gas-prices-gasbuddy-best-day-to-fill-up/3399198002/