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According to ColoradoGasPrices.com, the average retail cost of a gallon of gas in Colorado dropped two cents in the past week, to an average of $3.21 a gallon.

Nationally, prices dropped by more than a nickel in the past week to an average of $3.34 per gallon.

In Denver, the lowest retail price for unleaded gasoline is $3.07 a gallon, according to ColoradoGasPrices.com.

The website ColoradoGasPrices.com says the prices on Sunday were about the same as the same day one year ago, but more than 20 cents a gallon lower than a month ago.