Old Gas

It can.

You want the tank full, to prevent moisture, but you want the gas fresh. You can't win.

When you fill up, use a name brand fuel stabilizer.

I don't think *months* is that big of a deal. Years would be a different story but cars sitting for months is pretty common. I have a car like this (not a Prius though, that one gets regular use ) that my kids occasionally use when they are back from college. It's very lightly used only during holidays and college breaks and sits idle for months between the uses - has been for the last

Your location should be a factor though, is it a humid area? Is it sitting outside? Other than that I don't think several months between the uses is that big of a deal.

The gas, lines and tank would still benefit from fuel stabilizer during those months layoff.