Independent of Toyota, they tested "dozens" of car computers from recent crashes. They had to use recent crashes because the computer can lose memory when disconnected from power. They found that the drivers were pressing the accelerator, not the brake. There is still the problem with the floor mats getting under the accelerator and jamming it up, this is what killed the CHP officer and his friends in the Lexus in California. Apparently Honda had such a problem so they redesigned the throttle so it pivots from the bottom, not from the top, to fix the problem.
Toyota's data recorder is not the same as a commercial aircraft's flight data recorder. It's not of a robust design that records data at all times. It's not infallible, and it's not designed to record all crash data, so it can't be considered absolutely reliable. The Department of Transportation has experts at analyzing accidents and data, and they worked independently of Toyota. I think this is a pretty strong finding.
I don't have the cite, but I read an article where they took a number of cars out, got them up to top speed, and with their foot holding the throttle wide open they stood on the brakes. In every case they were able to stop the car.
Edit: I found a cite: Car & Driver did a test of three cars, all stopped.I think panic and publicity were the main causes of the Toyota problem, floor mats aside.
In a car that does not have an electronic shifter, there is no reason why you can't put the car in neutral. If you have a stick shift, you can stand on the clutch. And if you're on a straight stretch of road, you can turn off the ignition, being careful to put the key back in the Run position so you don't lock the steering column. You'll lose your power assist for steering and brakes, but they still work when you put some muscle behind it. It's easy to panic in such a situation, of course, which is where mental and physical rehearsal and training come in to play.
http://online.wsj.com/article/SB10001424052748703834604575364871534435744.htmlhttp://tech.slashdot.org/story/10/07/14/0115223/Toyota-Sudden-Acceleration-Is-Driver-Error