CHICAGO (WBBM) — The average price of a gallon of gasoline in Chicagoland is hovering just above $4 a gallon, and that has led to reports of gasoline siphoning in some suburbs.

WBBM’s Mary Frances Bragiel reports, west suburban St. Charles had two reports of gasoline theft last month, prompting police to advise residents to park their vehicles in the garage.

LISTEN: Newsradio 780′s Mary Frances Bragiel Reports

In Naperville, more than $900 worth of diesel fuel was siphoned out of four trucks, which investigators believe is connected to high gas prices.

Beth Mosher, a spokeswoman with the AAA Chicago Motor Club, says the average price for a gallon of gasoline in the Chicagoland area is $4.05., up 20 cents from a week ago. But AAA believes that while prices won’t be dropping soon, predictions of prices spiking another dollar a gallon are unlikely.

“We think $5 a gallon is presumptuous at this point in time,” she said.

And that, Mosher says, should keep motorists on the road this Memorial Day weekend.