DETROIT (WWJ) - If you filled up your gas tank Sunday, you may have noticed that prices are down a little bit from a day earlier.

Speaking live on WWJ, AAA Michigan spokeswoman Nancy Cain says the downward trend in gas prices may continue.

"Prices are down a little bit already. If you filled up ... about $4.11 a gallon, down from $4.13 from the other day. We're about $4.09 on average, down 14 cents from our all-time high," notes Cain.

"The crude oil price is down; it's been below $100 ... so if this continues, we can expect to see a little relief at the pumps, the next few days even," says Cain.

Cain says prices will come down a little bit more, but by just how much and over what period of time is still anybody's guess.