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Do you want to save money on the pump? Refuel on Monday morning on the way to work.
That's the advice of GasBuddy, the fuel-saving app that records real-time data from more than 150,000 service stations across the country.
USA TODAY GasBuddy judged the best day to fill up and the worst day to fill nationwide and in every state.
While Monday is the best average day nationwide, Friday is the worst day. (Scroll down to get detailed information on the best and worst times for fuel procurement.)
"Very early in the week when gas stations are usually a little quieter is a great time to refill, "said Patrick DeHaan, head of oil analysis at GasBuddy. "We generally see more volatility and higher prices during the week."
Monday's prices rise in the afternoon, so it's often a good idea to fill up in the morning. On Fridays the prices increase partly because some stations want to make more money before weekend excursions.
Stations are the busiest on Friday at 5pm, according to GasBuddy.
Drivers who refill exclusively on Friday could, according to GasBuddy, save between $ 20 and $ 30 a year by switching to Monday.
There are exceptions. For example, Tuesday is the best day to be replenished in 19 states.
Living in Utah? The best day is Sunday. Hawaii? Try it on Wednesday.
While Friday's national average price for gas reaches its highest level, Saturday is the worst day in 16 states, while Sunday is the worst day under 12.
The Best Day To Buy Gas By State:
Monday : Alaska, Arizona, California, Colorado, Connecticut, Columbia, Florida, Idaho, Illinois, Indiana, Kentucky, Maine, 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
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Tuesday : Alabama, Arkansas, Delaware, Georgia, Iowa, Kansas, Louisiana, Maryland, Minnesota, Mississippi, Missouri, Nebraska, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas , Wisconsin
Wednesday : Hawaii
Sunday : Utah
The worst day to buy gas by the state
Saturday : Alabama, Connecticut, Hawaii, Kansas, Maine, Maryland, Mississippi, Missouri, Montana, Nebraska New Hampshire, New Jersey, New Mexico, Oregon, South Carolina, South Dakota  Sunday : Arkansas, California, Colorado, Delaware, Georgia, Iowa, Oklahoma, Rhode Island, Tennessee, Texas, Virginia , Wisconsin
Friday : Columbia, Kentucky, Louisiana, Minnesota, North Carolina, North Dakota, Pennsylvania, Vermont, Washington
Thursday Thursday: [Arizona] Florida, Idaho Illinois, Indiana, Michigan, Ohio, West Virginia
Wednesday : Alaska, Nevada, New York, Wyoming
Tuesday : Utah
Follow USA TODAY reporter Nathan Bomey on Twitter @ NathanBomey .
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