In the US, we see around 3 trillion vehicles miles per year (effectively 100% ICE) and around 290k vehicle-initiated fires (
Source, PDF). So ICE has around 11M miles per vehicle fire. Worth noting that most of these fires probably occur in older vehicles.
Zero probably has around 6 million vehicles miles across all their bikes sold since 2009 (guessing ~1500 sold, 4k miles average). I haven't heard of a single Zero-related fire, though obviously that doesn't mean there are zero Zero-related fires.
Nissan has sold around 50k Nissan Leafs worldwide. Assuming 10k miles on average, then somewhere in the ballpark of 500M vehicle miles.
After searching the net I can only find two fires related to a Nissan Leaf.
Fire 1 was in Hawaii:
forum link,
news article. No real information other than the fire started in the garage.
Fire 2 is a burned salvage Nissan Leaf. InsideEVs
claims this is related to a fire (forest fire?) in Colorado but provides no details, claims the battery survived intact.
Discussion on GM-Volt forum questions the forest fire explanation, noting damage to the rear bumper and tire sidewall separation (perhaps driven on damaged/flat tires).
Obviously not all Nissan Leaf vehicle fires will be major news stories, though I wouldn't be surprised if there was a healthy interest in emphasizing these reports.
Other interesting notes:
* Nissan says about two dozen Leafs were destroyed in the 2011 tsunami. None caught fire, all battery packs remained intact.
Link* Camry plows into Chevy Volt. Camry catches fire. Volt is 100% demolished, no fire.
Link.
We should expect to see more EV fires as the vehicles age and as more are sold, of course.. will just be interesting to see if a pure battery EV is more or less likely to catch fire than a gas vehicle. Both have low voltage electrical systems (which seem to be the source of the majority of the Fiskar fires), so compare high voltage battery pack vs a tank of combustible fluids..