CBS News | Cheaper oil sends Exxon, Chevron to worst quarter in years CBS News DALLAS - Cheaper oil is leading to the lowest summer gasoline prices in years, and it is causing heartburn for oil companies and their shareholders. On Friday, Exxon Mobil Corp. reported its smallest quarterly profit in nearly 17 years -- although it ... Low Crude Prices Hammer Big Oil Companies Profit at oil firms hit by fall in crude Exxon, Chevron earnings sink as oil tumbles |