AAA says gas prices are about to fall

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(CNN) -- You can start to expect lower gas prices with the end of summer nearing.

The American Automobile Association on Thursday said prices this fall may drop by as much as 25 cents per gallon. That would make the average about $2.40.

That's down 35 cents a gallon from July fourth, when gas was $2.75.

Factors driving gas prices down include a decrease in demand after Labor Day and the shift to a winter-blend gasoline in September that's cheaper to produce.