Yes the dealer drove the car and yes, they too smelled the natural gas odor, from 10 feet away. It doesn’t make any sense. When we bought the warranty the dealer said that it covered "everything "from bumper to bumper. The selling point was that we would have to do no maintenance, only buy fuel.
Someone else thought that it could be the ceramic material in the brake pads. They’d the same smell after a brake job that went away after they replaced the pads.