Cold Weather Gas Tank Additive

Dtaylor wrote:
Gas has a freezing point of somewhere around -80 degrees. It may gel a little before that but cannot recall exactly where

This is true but in the old days when Gasoline was, in fact, gasoline, moisture (Water) would often condense inside the tank, or it might get in via other ways (I do have a story about that), and since gasoline is less dense than water it would pool in the low spots in your fuel line and eventually freeze and block the line.

Alcohol is a solvent, among other things it dissolves WATER. Taking it into a solution which does not freeze and which can then be passed on to the cylinder, burned and exhausted.

So back in the 70s (for example) Standard/Amoco (not BP) put gas line antifreeze in the tank (HEET brand in fact per one source) and I had to help a person or two by suggesting same in their tank (I burned Standard/Amoco)

Alcohol was added at around 1 pint per 15-20 gallons (that is around 1 percent,

Today they put in 10 percent so you need add nothing for cold weather.

Only need additives if storing for a long time or if you want to run something like injector cleaner.