Racer D sounds like he knows more about this than I do, however if were me, I would drain it.
My understanding is that you don't want to leave gas in your tank for more than one month. Since it has been in there for 6 months, I would just get rid of it. Yes, it might be a pain, but it seems like with these cars, people are rewarded for being a bit anal with regards to maintenance issues.
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