How long can fuel stay in the tank safely?

[986Porsche986]

So.... my boxster has been garaged since May 16, 2011. At that time I ran it (she ran great!) then I put about 3/4 of a tank of Chevron Premium fuel before I put her back in the garage. I have been working out of state where my boxster is garaged and I haven't had a chance to run it since then. (I did not put any fuel stabilizer because I didn't think I was going to be away for this long.) I should be heading back sometime in September, but I need some advice on the fuel issue. Should I try to siphon some fuel out and then add some new fuel before I start it or do you think the fuel is still ok as it is. The temperature in the garage has been about 95 degrees F at the most and no colder than 55 degrees F.

Please give me your thoughts.

Thanks.

Mark

2002 S Artic Silver