Many metro areas are already seeing prices well over $3 a gallon, many places in San Diego County are even seeing prices higher than $4 a gallon.
Turns out, "the case of the Mondays" isn't a thing when it comes to pumping gas.
Monday was also the best day to buy gas in 2017, according to a previous study.
Friday is the worst, at least in 19 states.
"The national average is now at its highest point since November 2014 with average gas prices advancing in almost every state", said Patrick DeHaan, head of petroleum analysis for GasBuddy.
"But when 49 of the nations 50 states are going up, there's a lot of factors that go into gas prices".
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According to GasBuddy's study, an analysis of foot traffic data at gas stations across the country found the pumps are less busy on Sundays and Mondays - with Fridays being the busiest.
AAA spokesperson Jeanette Casselano said the current national average is not expected to reach the highs recorded in 2014, which averaged $3.34 per gallon and peaked in April of that year at $3.70. Friday is the busiest day.
Finally, if you don't like to wait in line, gasbuddy.com says to fill up Monday or Tuesday between 8 a.m. and 10 a.m.
GasBuddy is a smartphone app connecting drivers with their Perfect Pit Stop.
You may have noticed gas prices in Louisville are up this week, but one expert said it has nothing to do with the Kentucky Derby. Founded in 2000, the original GasBuddy website was a pioneer in crowd-sourced information, leveraging technology, big data, and a passionate community that now connects more than 70 million users with real-time, accurate fuel pricing information as well as reliable reviews of gas station amenities and services.