But where is the spark coming from if the battery skids along the tarmac? The contacts are not touching each other (and if they did, still won't spark) and the metal-on-tarmac is not going to magically spark. Plus there's a million other possibilities of non-cellphone metal scraping the tarmac near a gas pump and that's not taken into consideration.

Plus the gas fumes don't stay near the ground anyway. It would take a LOT of gasoline on the ground -- a spillf that needs attention, not being ignored -- to create enough fumes down there to cause ignition.