Chuck just checked my 120's and they were perfect after running (and sitting) for several seasons on E85. We definitely have a mixed bag of results!
This thread really defines "a mixed bag of results"!
First of all GN's do not have carbs which is a entire different and more prevalent issue than injectors, so we should not equate our cars to those not injected, and also not to newer Flex fuel rides with different lines and pumps.
It appears the more southern areas have less issues than colder climates? Our local e-85 has never been less, but sometimes up to e-90 in our hot summer months.
The fact about pump gas to start loosing octane after just 3 weeks is widely known, so any car should be using a stabilizer if a tank of gas, or e-85, will last more than a month.
Last year at SEMA I talked with tech reps from Joe Gibbs and Stabil about the value of using a fuel stabilizer, and they had lots of real-world knowledge about how effective their products are when added to fuel including e-85. I have more specific questions for them next week after hearing about some of these e-85 issues plus the research I have done this past year.
Since my street and race car both use e-85, I buy it using 5 gallon containers and treat each one with a stabilizer before I put it in the car as needed.
Since the race car will sit for the hot summer months, the e-85 is drained and a little gas it put in to start and run the engine occasionally. The fuel cell is stainless and line are mainly metal and the pump external, no issues have been found in ~3 years including the injectors that Chuck tested.
He has tested e-85 injectors for us and no goo has been present?
Having done a dozen or more e-85 conversions here we have not seen any signs of deposits or corrosion there either?
We have torn down a few of these engines, and the internals look no different than using gas.