Sales at major U.S. retail chains fell 0.3% last week, according to the International Council of Shopping Centers. Same-store sales were up 4% year-over-year, the indudstry group said Tuesday. "Record high gasoline prices have begun to take more of a toll on consumer spending," said Michael Niemira, ICSC's chief economist. In a special survey for the retail group, 58% of U.S. households said they were cutting back on discretionary spending because of high gas prices. Last week, average retail gas prices rose by 6.2 cents to a record $2.654 a gallon, up 17% in the past seven weeks, the Energy Department reported Monday.