That's what I figured. I ripped the carpet out when we had a bad rain storm a few years ago, and never bother to replace it. That floor just gets very hot to the touch. The carpet works as a good interior insulator, so you don't feel it in the car with carpet. My guess is if it got hot enough to keep the car from catching fire, I'd already have passed out from heat stroke inside the car. I may go find some cheap outdoor carpet to put on the back hump, but otherwise I don't care. It's my commuter car, so no biggie.