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Actually some of the chemicals in gasoline for emissions once removed also improve fuel economy.
You may well find your "washed" gasoline gets you better fuel economy than true e0.
And to be honest if you are doing a good job separating you should be able to "get away with" your own washed gas during WARM weather, you would have to double check there isn't any aluminum,magnesium or other exotics in your injectors or fuel path. And you also definitely must get an old fashioned high quality aux. gas filter (toilet paper bypass type). You can still buy them (complete kit) for a couple hundred an I believe you could have almost a completely normal engine life using washed gas with a toilet paper filter (which cost $0.99 and can remove water), again so long as you limit it to warm weather. I believe you can get away with a fair amount of water in the gas, seems like its about 1% but again, no chlorine, no salts, no cold weather and I wouldn't worry so much about the octane, 84 octane was a standard rating for many many years, especially out west.
I did actually consider what you are doing (but for other reasons) but figured too much work.
Also don't dump the residue down the drain, there are uses for whats left AKA weak alcohol and obviously if someone has a tank for it bring it there.
Cheers
Ryan
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