Earnings rose 146% in DaimlerChrysler's ( DCX) second quarter, pushed up by a one-time gain and a strong performance at Mercedes. The car and plane company earned $2.3 billion, or $2.26 a share, in the quarter, compared with $900 million, or 93 cents a share, a year ago. The latest period included a gain of $1 billion, or $1 a share, related to a change in the value of an option it uses to preserve the value of its EADS investment. Revenue was little changed at $49.3 billion. "The earnings improvement was primarily due to the significant increase in operating profit achieved by the Mercedes Car Group. The Truck Group and Financial Services also improved their operating profit. In total, these increases more than offset the decrease in operating profit recorded by the Chrysler Group," the company said. At Chrysler Group, operating earnings were $65 million in the quarter, down from $695 million a year ago. "The decrease in operating profit was primarily the result of a decrease in worldwide factory unit sales, a higher mix of fleet vehicles and negative net pricing," the company said. Mercedes sold 325,500 vehicles in the second quarter, up 6% from a year ago. "The Mercedes Car Group reported an operating profit of $1,031 million, a substantial improvement compared with the second quarter of last year ($15 million). The increase was caused by the division's higher unit sales (+17,400 vehicles) and an improved model mix, due to the full availability of the new S-Class and M-/R-Class. Within the framework of the CORE program, additional important efficiency-improving actions were implemented, which also had a significant positive effect on earnings."