[Melnic]

I have 4000W Propane generator that powers the essentials if needed. I don't think Propane is as efficient $ wise but I generally have 2-3 full propane tanks under my deck. I just cycle through them for the grille.
When we had power out for 4 days during the wind storm, I used up 1 and went to get another at the gas station. No power but they had a key to unlock the propane and I paid cash.
My house has a 1000gal propane tank but I have never explored how I could tap into that or not.

As mentioned, If there is a wide long term power outage, what is the point to gasoline if you can't buy any.
If you go gas, you should get a number of 5 gal jugs cause if there is a wide spread outage, you will want to get a bunch of gas quick and either siphon from a car or drive a distance to get it.
Count on those jugs not being available on a wide spread outage. (My neighbor found this out in our old house during Isabel)