Wow a full tank on just a weekend thats alot.
Yer but usually the ideal environment conditions cannot always be met, winter for example.
Well i have a mate who has a TT supra RZ and uses it as his weekender i asked him about what he does and he rekons he will refill the tank roughly once every 2 months.
Like said in the article above; "you can see that tanks which are not emptied and refilled regularly can create operational problems"
So I'm thinking if you have fuel sitting in the car for a few months and are boosting it with 2 month old fuel that it wouldn't be healthy though..