[safe]

Originally Posted by Schulisco

The problem on the 911 is: The tank is made of steel without any surface protection - it can rust and it will if there's too much water/moisture in it. For storing the car just a few months is not a problem. But the longer the car sits with only half or less full tank of gas, the more air and moisture is in the tank which can force detoriating fuel and rusting, especially when the fuel contains ethanol which attracts water...

If you use fuel storage be aware that it takes some time to mix with all the fuel in the system. The fuel pump in a SC pumps 1000cc in 30secs. To pump a full tank of gas of 80l it takes at least 40mins. This is a ride of at least 20mls...

Air isn't circulating the tank when stationary over the winter. If you store the car relatively warm and at a constant temperature there will be no water or rusting.

Ethanol doesn't magically make water, if there is water in the fuel system the ethanol will absorb it and purge it when you run.
Without the ethanol the water will "pool" at the bottom of the tank and rust it.
In cold climates we used to add ethanol in the winter to remove water.

No ethanol does not deteriorate gasoline. Gasoline looses its "flammability" over time, that's why I keep the level low so I can fuel up in the spring, but 6 months is really nothing to worry about.

Pretty confident that pouring 60 liters of fuel, with some force like at a gas station, into 20 liters will mix it pretty good. Non issue.