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

        April 9, 2019 USA Today | United States | fossil fuels: gasoline

According to the fuel-savings app GasBuddy, which uses real-time data from about 150,000 U.S. gas stations, the cheapest filling day is Monday, while Friday is the most expensive, primarily because of changing traffic levels. The best and worst day varies for some states, but choosing the cheapest day in your area could save $30 a year.