Radon compliance has been beat to death here. You can go to the old threads here if you want to read pointless discussion. There's nothing to gain for me by sharing anything.
I was only interested in a defnitive answer, no matter how much that answer would have been ignored if it wasn't what certain people wanted to see.
Mike, my understanding is that the reason for the Radon unsafe seating position is that is as low as you can sit and still see out of the car to drive.