A little closer reading of the report[1,2], shows that only 26,000 automobile fires occur on public highways. That makes Tesla's single datapoint worse than a conventional Auto.

All cars: 1 fire per 116 million vehicle miles/year

Tesla: 1 fire per 113 m vehicle miles/since inception

Obviously, the Model (s) being a newer Tesla model does not have the full historical amount of "Tesla" Miles as the denominator.

[1] http://www.nfpa.org/~/media/files/research/nfpa%20reports/ve...

[2] Furthermore, only 2% of non-deliberate fires start in the fuel line or fuel tank of a normal vehicle