The workweek begins with California under an important fuel price threshold. The average for a gallon of regular has dropped below $4 a gallon.
Today's average for the state is $3.979 a gallon, according to the AAA Fuel Gauge Report.
Analysts had said on Friday that the price would likely breach the $4 mark over the weekend, and it did, reaching $3.992 a gallon on Sunday.
The state's average hadn't been below $4 since Aug. 10, when it was $3.98 a gallon.
Marie Montgomery, a spokeswoman for the Automobile Club of Southern California, said that the new average was a big drop from the record high price of $4.671 a gallon set Oct. 9.
But she added that a lot of drivers probably shared her main question. "Why did it get so high in the first place?"