We referenced a really nice explanation from Car Talk regarding different levels of fuel octane -- here's the link to Car Talk's nice explanation and our explanation of how it relates to the Tundra.
Car Talk's explanation (pics and everything):
Car Talk
Our
Premium v. Regular Tundra Tip is that premium fuel typically does include some fuel system cleaners, so it might be worth running a tankful every once in a while assuming you're too busy or too lazy to buy some fuel system cleaner at the auto parts store.