Based from the article, it appears to be an electrical failure stemming from the fusebox. Also, all the fires had been spontaneous with no prior warning (i.e.: your burning smell). Lastly, I think these fires are exceptions to the rule because this can occur in any car model; however, the chance of a spontaneous fire that can envelope the entire car in a matter of seconds is quite rare.

Maybe you're just driving really hard? I've read many posts of "burning smells" after a car is pushed aggressively.