Actually, this is for the 914 - it's down to about a quarter tank of gas. I won't be drving her much more but I can start her up every few weeks as she sits in the garage all winter. Is it best to a: fill the tank or leave it at 1/4, b) add a stabilizer, c) add injector cleanerif I do fill it or d) any combination of the above or something else?
Thanks!

 

Add a fuel stabilizer to a full tank. This will prevent condensation from building over the winter. It's also advisable to change the oil so that when you fire her up for the first time next year fresh oil will be pumping through her veins.

Edit: Disconnect the battery as well.

 

Just to add: I'd go one step further than disconnecting the battery and bring it inside if your garage isn't heated.

 

Good idea.

A car cover isn't a bad idea either. They aren't terribly expensive and they keep your paint safe.