[HoodPin]

IMHO, I would not run that fuel thru the 911's engine. I think best would be try and drain/siphon it out into another container, to validate its condition. Put fresh gas in the 911, and use the drained gas (to the extent it doesn't look funky, in lawn mowers, etc. Gas that sits for a long while may have broken down, turned to varnish, mixed with condesate, etc. etc., none of which is particulary good for a sophisticated engine. You may even have some "layers" in the tank.

However....if you insist on running the car with the gas in the tank, I would consider adding some Fuel Stabilizer. It may not actually be totally effective after the fact (fuel breakdown-wise), but it may help. Additionally or alternatively, some Gas Drier may also help recombine any condesate/water that may have accumulated in the tank.

Furthermore, if a layer of condensate did settle into the tank, after 9 years be wary of possible rust in the tank which may foul filters, etc. If there's any way to peer into the tank, I would do that first before adding/using what's in there.

Good luck....