San Diego ? Investigators with Toyota and the federal government were unable to make a Toyota Prius speed out of control as its owner said it did on a California freeway, according to a memorandum obtained Saturday by The Associated Press. A congressional spokesman said the finding cast doubt on the driver’s story.

James Sikes, 61, called 911 on Monday to report losing control of his Prius as the hybrid reached speeds of 94 mph. A highway patrol officer helped Sikes bring the vehicle to a safe stop on Interstate 8 near San Diego.

The findings raise questions about “the credibility of Mr. Sikes’ reporting of events,” said Kurt Bardella, a spokesman for California Rep. Darrell Issa, the top Republican on the House Oversight Committee.