I have had mine since mid November and had good intentions of keeping it stored till after hunting season and the winter here. Well I can tell you once you start driving a GT 350 you really don't want to stop driving it. It is a fun car to drive and I still get it out every nice day we get. I still plan on keeping it that way so I would say around 3K miles a year. That's a goal I will probably change come summer.
The widespread use of salt during New England winters will keep my 350 off the road from first snow in the fall to approximately May 1st each year- estimate I'll put between 3,000- 4,000 per year til death do me in.