I've seen in several blogs now where a commenter has stated that the Roadster is like "strapping a bag of cell phones to your head", in terms of the EMF radiation. So I picked up an EMF detector, sensitive in the 30-300Hz range (serendipitously equivalent to 1800 - 18000RPM), and took my Roadster for a spin.
For calibration, the meter shows around 100 milligauss when placed next to my iPhone on a call, in the position my head would be.
In the Roadster, I found that the only place in the cabin with noticeable EMF levels is just above the headrest; the reading peaked there at 50 milligauss (half the strength of a cell phone) for a couple seconds during peak acceleration. While cruising, the EMF reading there was around 3-4 milligauss, and dropped to imperceptible levels throughout the rest of the cabin.
In other words, the kinetic energy of the Roadster is a far greater concern than the electromagnetic energy. Thought some of you might like to know!