As gas prices continue to rise, the website GasBuddy did an analysis of which day of the week is typically the best day to fill up.
Their conclusion: Monday
GasBuddy says it analyzed three years worth of fuel price data and found that Monday offers the lowest average, making it the best day to fill the tank. Thursday is the worst day to buy gas, having the most expensive average according to the website’s analysis. However, they add that the best day can depend on what part of the country drivers are located.
For example, they found that so far in 2017, Monday is the best day of the week in 23 states, and was also the lowest average day in 36 states in 2016, while 8 other states had the lowest average on Tuesday.
Overall, however, the study consistently found that filling up earlier in the week will save motorists money, and GasBuddy found a potentially intriguing reason why.
“The rise in average prices towards the weekend could be to blame on an influential report from the Energy Information Administration (EIA) issued weekly on Wednesdays, which could push prices higher the day after, depending on if data in its report is as expected or a surprise,” said Patrick DeHaan, senior petroleum analyst at GasBuddy in a statement. “Since commodities trading isn’t active over the weekend, it typically allows stations to ‘let it ride’ over the weekend, culminating in lower prices by the start of the work week.”
GasBuddy estimates that if every U.S. motorist bought gasoline on Thursday for an entire year, they’d collectively spend an extra $1.1 billion more than if they filled up on Monday.