The average price of gasoline has dropped 5 cents over the past two weeks, to $1.77 a gallon. Industry analyst Trilby Lundberg said Sunday that the price is 56 cents per gallon cheaper than a year ago. Lundberg says it's less likely that gas prices will continue to slide because crude oil prices are almost unchanged from a month ago. In the Lower 48 states, the highest average price of regular gasoline was $2.40 per gallon in San Diego. The lowest was $1.42 in Tucson, Arizona. The U.S. average diesel price is $2.07 per gallon, down 6 cents from two weeks ago and 88 cents per gallon under its year-ago point.