A state association whose members include gasoline retailers and heating oil distributors want federal lawmakers to review the commission that oversees trading of commodities, including oil. In a letter to Connecticut's congressional delegation, the Independent Connecticut Petroleum Association asks them to press for an investigation of the Commodities Futures Trading Commission and that group's oversight of the New York Mercantile Exchange. Prices for commodities such as diesel fuel, natural gas and gasoline are set at the exchange, and the request comes as prices for those products continue to rise. "What is at stake are, quite literally, the prices paid...