Here we go again...
I've been posting this for years (most recently in July of this year), and I've heard from "A' owners of all ages who agree.
Take it or leave it, believe it or not... it works.
Here's a (slightly updated) repeat of a post of mine from an old "Do A's tolerate Ethanol..." thread. I still swear by it. MMO and Star Tron are two of my six steps to coping with ethanol:
"In prior threads here and on the old Barn I shared my experiences with creeping neoprene goo after E-5 appeared in New England. I'm not going to cover old ground; we've all heard about how the fuel separates, evaporates, turns to corn syrup, dissolves neoprene, etc., etc.
Cutting to the chase, the following formula has given me four (SEVEN as of 2011!) consecutive years of driving without a single fuel-related problem... E-5, E-10, 87, 89, 91 Octane, whatever:
1) HARD Neoprene gauge float, NOT CORK.
2) CORK gauge gaskets, NOT NEOPRENE.
3) MMO added to gas, per manufacturer's instructions.
4) Star Brite "Star Tron" (the blue stuff) added to gas, also per
manufacturer's instructions.
5) Run carb dry at the end of each day.
6) The on-board computer (driver) needs to adjust the spark and
GAV "to taste." (The car's taste, that is.)
There, I said it; take it or leave it, it works for me.
Whether it's a day, a week, or a month between starts, the "A" starts first time, every time. (As do my lawn mowers and snow blower, on the same fuel diet, no matter how long the fuel sits.)"