Because Traction Control is never truly "off", I never drive with the button in the "on" position.

The only thing I could think of as far as how that may be possible is the fact that it is SOOO intrusive... Say you are hitting a freeway bend at the speed limit. The freeways here in CA have bumps, jumps, big cracks..... They are HORRIBLE. Who's to say that with it engaged that every bump it doesnt kick in????? Even a little..... What about the roads that dont get maintained that feel like your driving on washboards... All it would take is a little intruding on its part, spread over the course of a tank to make a difference... This is my theory, just throwin it out there.