High octane (93) unleaded gasoline. But it depends. In the eastern part of the ST---TX, LA, MS, AL, FL there will be no scarcity of places to buy white gas, compressed cycliners of gas, denatured alcohol, etc. In the western states sources of whatever it is you might need tend to be more spaced out, fewer and farther between. If you get a Featherlite 442 Coleman stove, you will be able to get fuel for it anywhere. Getting the fuel from the gas station hose into the stove is another matter. Fact is, I could not unless certain other things such as a larger gas can and funnel were available. You must bring your own little funnel. It weighs next to nothing. This gas station hoses run at a certain minimum velocity that is too much to get into that little hole in the stove. You have to pump the gas into a larger container, then funnel the gas into the stove. No larger container, no gas in stove. You can work it out. If you can deal with that problem, any lightweight stove using white gas or unleaded gasoline is just fine. There are department stores across the country that sell canisters of compressed gas, and the stove fixtures that attach to them. The lightest stoves you will find burn denatured alcohol. The fuel for this stove will be a bit more difficult to find in some places, but gasoline is available just about everywhere.