A number of years ago (18 years), PowerMaster published five fact sheets on "Facts About Fuel". Their Fact Sheet No. 5 was on "Storing Fuel for Maximum Shelf Life". The following is from their two-page fact sheet:
"...one of the frequently asked questions is, 'What's the shelf life of fuel?' The answer is both simple and easy: Properly stored, model engine fuel will last almost indefinitely. So....what constitutes 'properly stored'? ... Contrary to many things you might have read or heard, just about the only thing that adversely affects model fuel is the absorption of moisture from the air. Keep the air away from it, and your fuel will likely be potent longer that you are! Methonol - the major ingredient in model fuel - is hygroscopic. This means it's virtually 100% soluble in water, and absorbs moisture from the air like a vacuum cleaner sucking up dirt.
[then there is a long discussion on keeping containers sealed so that the fuel cannot absorb moisture from the air. Then, a short paragraph --]
"While it's true that the UV sunlight (or in fluorescent lights, for that matter) will cause pure nitromethane to deteriorate over time, it's our experience the once nitro is in solution and substantially diluted, the deteriorative effect is relatively minor. ... While it certainly won't hurt anything to store fuel away from direct sunlight, it's our personal opinion that the adverse effect of sunlight on fuel under normal operating conditions is too little to worry about."
On the subject of PowerMaster Fact Sheets, these five fact sheets were two to three page affairs with the following titles:
No. 1 What's the oil content?
No. 2 Which oil is better - Synthetic or Castor?
No. 3 Nitromethane, the Mystery Ingredient?
No. 4 2-Stroke vs. 4-Stroke Fuels Is There Really a Difference?
No. 5 Storing Fuel for Maximum Shelf Life
Some basic but interesting and useful stuff. This was available from their website 18 years ago.
Keith