Does anyone know exactly what the properties of the fuel tank are, i.e what are the materials of construction/which particular plastic.
I definitely would not use dry ice.
When dealing with rubber lined storage tanks the life span was seriously affected if contaminated with traces of organic materials.
So there will definitely be things not to use.
If "the words of wisdom" passed down the food chain by "the elders" is such that time alone leaves the tank marginally smaller then I can only imagine that the use of copious volumes of warm air passing through the tank will aid that process. But if it is too hot it may have a detrimental consequence.
(Pour boiling water into a fizzy drinks bottle and watch what happens ~ it shrinks and becomes far less pliable).

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