"Gas is down 54 cents from its peak of $3.94 in early April thanks to a drop of more than 20 percent in the price of oil. The decline means Americans are spending roughly $200 million per day less at the pump. Yet the savings hasn't encouraged people to drive — or spend — more this summer. They're buying about 5 percent less gasoline than they did last year, even though a gallon is 18 cents cheaper."