So much for those dollar brands. While the recession may have consumers trading down, they may want to smarten up. Consumer Reports’ latest tests of laundry detergents revealed that using top-rated detergents like Tide 2X Ultra for Cold Water in cold water cycles, can save people up to $140 a year. At 19 cents anaverage load, it costs roughly $80 a year less than the priciest detergents, and using cold water can trim another $60 in energy costs. Tide’s 2X Ultra for Cold Water, a C...