AAA says regular gas nationwide fell Sunday to $2 a gallon. American consumers are getting a windfall of billions of dollars a week thanks to low fuel prices. The U.S. economy has little to show for it. The price of a gallon of regular gasoline fell to $2 nationally Sunday and was well below that in much of the country, AAA said, marking the lowest price outside of a recession in more than a decade. As a result, Americans reaped more than $100 billion in savings this year alone, or about $550 per licensed driver, according to the motorists group. When gas prices began plummeting last fall—they were above $3.50 a gallon as recently as August 2014—many economists predicted the savings would act as a giant tax cut by jolting long-weary consumers into stronger spending and pushing up sluggish economic growth. Instead, the economy remains mired in the slow-growth […]