Another tip:

I have several things that work on propane and propane has a very long shelf life. My generator will run on propane as well. So I have several portable tanks that I rotate. I use use them and refill.

In the US you can buy BBQ propane tanks in many hardware stores. It is cheaper to get them refilled at a propane provider (many gas stations do this) vs. swapping them at a hardware store. Propane will result in lower horsepower for your generator but it burns cleaner and stores longer. I can cook with it and generate power. This is not a replacement for automotive fuel but it is a good addition to your fuel preparedness.