CBS/AP) Toyota cast doubt Monday on a California man's claim that his Prius sped out of control, saying the report is inconsistent extensive testing conducted on the man's car last week.

At a press conference in San Diego Monday afternoon, Toyota officials said that the accelerator pedal was tested and found to be working normally and a backup safety system worked properly. The automaker said the front brakes showed severe wear and damage from overheating, but the rear brakes and parking brake were in good condition.

The motorist, James Sikes, said his car raced to 94 mph on a freeway near San Diego last week. The March 8 incident ended when Sikes stopped the car with help from a California Highway Patrol officer.

Toyota refurbished Sikes' car and then ran tests while replicating the conditions Sikes described. The company's investigation was conducted in conjunction with similar testing by the National Highway Traffic Safety Administration.

The accelerator pedal was "found to be working normally with no mechanical binding or friction" Toyota spokesman Mike Michels said, noting that Sikes' model of Prius is not included in the recalls involving sticking accelerators.

Toyota reps said that the car's push-button power switch "worked normally and shut the vehicle off when depressed for three seconds as the 911 operator advised Mr. Sikes to do" and that the gear shift was functional and capable of shifting into neutral to slow the car.

There were no trouble codes in the computer or warning lights on the dash either, reports CBS News correspondent Dean Reynolds.

The hybrid's unique self-diagnostic system found that the burned out breaks had been pressed lightly but repeatedly during Sikes' drive, Reynolds reports.

Michels said that the car's computers indicated "rapid and repeated on and off application of the brake and the accelerator" during Sikes' ordeal and that the company's testing found that pressing the brake while the accelerator was engaged - as Sikes described - tripped an automatic cutoff of gas to the engine as designed. The automotive Web site Edmunds.com demonstrated the same thing last week, Reynolds repots.

The Toyota officials maintained a tenuous balance at the press conference - stating that Sikes' version of events is totally inconsistent with the company's data and testing but shying away from saying that Sikes is being deliberately untruthful.

Asked by a reporter whether Sikes is a liar, Michels said, "We really have no comment on Mr. Sikes' story."

But Michels did say that "Since recent publicity involving recalls … claims of unintended acceleration have inexplicably skyrocketed."

"To say this incident was sensationalized would be an enormous understatement," he added.

"I think it also has to be mentioned that there are human factors," Michels said. "No one likes to talk about that, but people do mistakes in driving."

Former federal investigator Richard Schmidt studied a similar runaway phenomenon in Audis in the 1980s and said it turned out that human error was largely to blame back then and may well be now, Reynolds reports.

One study he noted had a related - and possibly telling - statistic.

"The 60- to 70-year-old group of drivers complained about unintended acceleration about six times as often as the 20-to-30 groups," Schmidt said.

But Rep. Darrell Issa, ranking member of the House Committee on Oversight and Government Reform - who has been closely involved in the Toyota investigation - seemed to shoot back at Toyota following the press conference.

"Vilifying or making rushed judgments won’t ultimately improve the situation and doesn't change the fact that for the better part of a decade, both industry and regulators neglected their responsibilities to put the safety of America’s drivers first," Issa said in a statement. "At the end of the day, this investigation is not about one incident, but rather the concerted effort to ensure that industry acts transparently and immediately when addressing vehicle safety concerns."

Earlier Monday, federal regulators said they were reviewing data from the gas-electric hybrid but so far had not found anything to explain the out-of-control acceleration reported by Sikes.

"We would caution people that our work continues and that we may never know exactly what happened with this car," the National Highway Traffic Safety Administration said in a statement.

Inspectors said they tried to duplicate the acceleration during a two-hour test drive but could not.

"They figured out very little," Issa, R-Calif., told CBS' "The Early Show" Monday morning.