Goto Sportsmart & get a gallon of that camper fuel in the red can. It'll last you forever.
In my experience it will not. Either you will use the stove a lot and therefore the fuel will be spent quickly, or you don't use the stove enough to do that and the fuel gradually loses its volatility and doesn't burn as well. I first experienced this at Round Valley one February (6 feet of snow) when I couldn't figure out why my Whisperlite kept sputtering and only burning about as hot as Sterno. Changing the fuel made all the difference.
I mostly use alcohol stoves now, so when I do buy white gas I just buy a quart to save the hassle of throwing the rest away. Unless I just want to pour the rest in a gopher hole in the back yard and light 'er up. (Just kidding.)
Gasoline and white gas will degrade over time, loosing its more volatile components and getting 'gummy' inside the can, fuel bottle, and your stove . As stated above, only buy an amount that you'll use up in short order (less than a season, or a year).
An option I started using is an isobutane canister stove in the warmer spring/summer/fall months. A canister will last 2-3 days if I'm only boiling water (no melting of snow), so I don't have fuel sitting around for years and its really easy to use, simplifying summertime adventures.
