Hi Gerald, been awhile. Good post Karl, I'd guess the ethanol in gas came from needing an Oxegnate to replace MTBE that has contaminated groundwater. Ethanol may also be as Octane booster, don't forget the big corn Lobby worked to get ethanol mandated as gas additive.
Personally, I'd avoid the E30 gas unless Flex-Fuel equipped, in absence of further info saying otherwise. If gas w/ no Ethanol is available, it might work to use pure Acetone in place of alcohol in MPGR mix? Pure acetone can be found at beauty supply stores, other sources may have extra ingredients. If memory serves, the alcohol in MPGR is to be a carrier fluid for aspirin, that's also compatible w/ gas. As a concept, not so much alky needed, just to "wash the aspirin down" the filler neck of tank.
And again- I've tried a test of one whole un-coated aspirin, put maybe a capful of hydrogen peroxide on it, it melted before my eyes. So I'll put aspirin/hydro. perox. together first, then add the alky last now. Still filter the mix into gas tank of course. I add Lucas fuel treat. at fillup separate from MPGR.
I made my own ELVIS using a Summit Racing sourced gas filter that screws together, intended for low-press system (carburetor). Can't say it made any difference, but for the zinc content I just cut galvanized nails up, some small copper pieces, no magnets, forget the other ingredients.
The Fitch has been around for years, I've no experience w/ it.
To me the beauty of MPG Remedy is-it works, it's simple to make/use and cheap except for Everclear. I've been told that 90% rubbing alcohol (Wally-mart) or denatured alcohol from big box hardware store will work too, in place of Everclear. Other grafted-in stuff is cool if it works for an application. I even have a hologram sticker on the outside of gas tank (can't say it worked either).
But the basics gotta be right to begin with- and I'm waiting for Karl to tell of his O2 Sensor replacement, I really hope it helps!!

Another thing Karl and I spoke of recently was the issue of fixing/improving the electrical grounds on the engine. The whole dang ECU/Sensor system, engine, car body and frame, must have good solid grounds!! Even the exhaust system (the O2 sensors). Rust/corrosion never sleeps. It isnt so expensive to deal w/ this. A "sleeper" issue somewhat related, is battery voltage creeping from + to - terminals ON the battery thru the accumulating acid/grunge that can build up. Keep it clean, the terminals, cable ends, the battery top. I periodically clean these, using spray can acid neutralizer, a rag and toothbrush, use a batt. terminal tool to dress the battery posts/cable ends, then use a bit of vaseline on the terminals and posts. Basic maintenance. Good to look at a winter sets in.
first bake, THEN frost the cake
Tracy G