Gas line antifreeze?

Here in Canada our Canadian Tire store (auto parts dept) sells gas line antifreeze for CDN$12.99 for 4 litres. It also sells 99.9 % pure
Methyl Hydrate as stove and fondue fuel (and some other uses I don't recall) for CDN$7.99 for 4 litres.
I'm not a chemist (nor a chemical engineer or engine specialist), so my question is: can 99.9% Methyl Hydrate can be used as gas line antifreeze?
Also, does anyone know the difference between these two products? (Other than price.)
Thanks for all replies.
Roger Jones, P.Eng.
Thornhill, Ontario,
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