White gas is different in that it has no additives. Unleaded gas does have addititves, and it will soot the bottoms of your pans. shrug - no big deal in a survival situation, but it makes a mess if you're just camping and trying to keep things clean.

I have a bi-fuel camp stove that's made to burn colemant fuel and unleaded gasoline. I have no idea what problems unleaded gasoline would cause in a Svea, if any. If you don't get an answer here, I'd suggest a board for Svea stoves or their support.

Same with Sta-bil. If there's something in your gasoline that would clog the Svea and render it useless in a week, you've got a problem with survival.