Don't forget gas isn't the only consumable. Many generators run a surprisingly short time (e.g. 50 hours) before calling for an oil or air filter change.

Also regarding having enough gas... it's a good idea to keep enough gas in transportable containers to get to whatever backup destination you might want to get to, so you don't have to depend on getting gas along the way. E.g. 3 or 4 five-gallon containers will get you pretty far, especially if you start with a full tank. And if you stay put you can use it in your generator.

That's the same gas I use for the lawn mower. I rotate the old gas out. Also add fuel stabilizer like StaBil. Our "getaway" vehicle uses premium so that's what the lawn mower runs on! <img src="/images/graemlins/shocked.gif" alt="" />

Steve