I plan to run my tank dry at least every couple of months. This is why. Here in the US, unless one is fortunate enough to live in a place where real gasoline is available (I don't), we have to run gasahol. Alcohol is hygroscopic. The longer it sits, the more water is mixed in. We have to run premium fuel. It doesn't have any more alcohol in it than regular, but, on average, it sits anywhere from 3 to 5 times longer in the gas station storage tanks because there is less demand for it. I have this from several gas station owners I asked about it. Being a motorcycle rider, I have known several people who have had their fuel gum up their fuel lines and injectors if it was allowed to sit too long, especially with premium. You can prevent this by using Stabil or a similar product. Or, you can keep the fuel fresh. I would prefer the latter.