DENVER, Colo (AP) The average price per gallon for regular grade fell nearly 21 cents between October 19th and November second; putting it at three dollars and 54 cents. That's the steepest two-week drop in almost four years, according to the Lundberg survey of fuel prices. The survey cites a seasonal drop in demand and lower crude oil prices, and predicts prices could fall another ten to twenty cents per gallon in the near future.