Put 10 or so litres a time through your car with a fullish tank of fuel. I have done this a few times, the fuel going into a Commodore V6 without trouble. The lawn mower normally gets a few tank fulls as well. It's surprising how soon 50 gets used.

 Stabil (or any other fuel additive) won't "fix" old fuel.  You need to add it with fresh fuel when you fill up.  I have done exactly the same as Osprey in my V6 Commodore without any problems.

Probably sounds bad but i always leave my boat over the winter months for around 6 months without a start. I keep the tank only half full(as it usually is after the last day out) and then the first spring day out just top the empty half of the tank with new unleaded and away i go. Have been doing this for the last 12 years with at times the fuel being left for over 8 months and have still managed to start it fine even without adding new fuel. From everything i read though i dont htink i would recommend it but so far it hasnt ever affected my 115 Merc 4 stroke. Think next winter i will put that fuel stabiliser in it though.

Just top the tank right up, like Buz, I've used fuel that had been sitting for nearly a year without any problems in fuel injected motors.

Thanks fellas, ended up syphoning it out for my 1990 commodore. Ended up nearly 100 ltr. May be a while till I use the boat so nothing lost.

Cheers Nev