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What's the advantage of e-free fuel other than more BTU's per gallon -that you pay a premium for???
We haven't found any...
Except avoiding potential fuel gasket/seal damage for antiquated engines that haven't been updated.
Certainly when alcohol evaporates it doesn't leave varnish or sludge-like deposits behind.
I do wonder if alcohol can react in some way with silica or quartz particles [a component of dust that's always blowing around and suspended in air] to form a congealing of the particles [possibly by an electric differential potential at the molecular level] and they appear not possible to dissolve with common carb cleaning solvents.
However this is pure speculation from observing [and repairing] silica [? ] making Honda EU2000i genny carbs fail, and is eliminated by adding a quality in-line filter after the fuel pump.
At the same time, particles of silica or quartz dust remain at the bottom of the tank, and are clearly visible.
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Biggest advantage I've seen is that it avoids ethanol's propensity for absorbing moisture - sometimes to the point of forming water pockets in the gas.
Lots of factors in play:
1. Length of gas storage - Obviously, the longer you store it, the longer it has an opportunity to absorb water
2. Air tightness of the storage container
3. Average humidity of the storage environment - If you live in a desert, it's less of a concern than if you live on the coast or in a tropic rain forest
4. Initial quality of the gasoline (which often contains quite bit of water, right out of the pump)
Generally, less water in your gas is better - and omitting ethanol helps in that regard.