Even then it's just a slow-burning fireball, not detonation, no shockwave.
Still more than enough to burn your windpipe, skin to 2/3rd degree and permanently disfigure you
All of which are symptoms of burning, not explosion.
And was still not really possible without some really unlikely conditions. Not that car fires aren't dangerous, regardless of whether the vehicle is ICE or otherwise, but the fireball thing doesn't really happen.