I have to go along with Jeff. I have a Haltech ECU, new hoses and a Turbo. E85 is great for boost! Runs cooler hence the less energy than gasoline. It lets me turn the boost up higher and make even more HP. Ethanol won't bother my engine.

What are R9 hoses? As someone with a carbed 914/6 what can I do to mitigate problems other than adding Marine Stabil (and how much of that per tank)?

Sae something or other R9. They are lined so the new fuels don't attack them, old type hoses will go bad now in a year here. Cant help with a six, wish i could. On my other carbed vehicles, I run them dry before storage. And the bottle has the ratio on it.