Also buying fuel for a petrol station is going to be more expensive than having a commercial tanker refill it. So ideally you wouldn’t be making large top ups from the local petrol station except under exceptional outages.

As for wider power outages affecting the fuel pumps, I suspect they might have their own generators too. But even if they don’t, outages can still be localised (eg road works accidentally cutting through the mains for that street - I’ve had that happen before too). So there’s still a benefit in having a petrol station near by.

To be clear, I’m not suggesting those petrol stations should be 5 minutes walking distance. Just close enough to drive there and back in under half an hour.

some natural disasters can render driving trickier than walking. extremely large snow storms, for instance. you can still walk a block, but you might be hard pressed to drive 5 miles.

(i don't have a bone in this particular cautiousness-fight; personally i'd just suggest folks producing DR plans cover the relevant natural disasters for the area they live in, while balancing management desires, and a realistic assessment of their own willingness to come to work to execute a DR plan during a natural disaster.)