And yes, I DID mean to use up whatever gas you had left and refuel PRIOR to storage.
I have stored my Beetle (at one time for five years) with a full tank of gas, but I also had an electric fuel pump with a kill switch on the dash.
When preparing for storage, I would shut the pump off and let the engine use up what was left in the carb float bowls and let the engine die.
You don't have that luxury, but then, fuel-injected systems are not as prone to varnishing as carbs.
But you are only gone for a month, so why am I babbling about this?!!!