The biggest thing would be the gas. Condensation will form in the gas tank, especially if it isn't full. That can create some gunk or possibly rust in there and poor running. I would keep the tank full and then when you do run it, try to go through that tank so you can replace it with fresh gas for the next long sit. I don't know how well that gas stabilizer works. I have heard good and bad rumors. Shouldn't be much condensation in the engine and what is there will be purged once you run it for a while. I do about the same as you. Run the commuter special all week but take the T out on weekends, if only to the dump.