So my friend with an EVO who lives by me had some gunk build up in his fuel filter (Central IL). Because of this, I relocated my fuel filter under the hood. The 05 STi puts them it in the backseat. I have checked my fuel filter several times and it has been clean. Granted, I have not been running as long as him, but wouldn't the fuel filter be an indicator that something wasn't right? This is assuming it's not oil in the injectors mixing with e85 but just figured the filter would stop anything before it makes it way to the injectors? Not sure but now I'm curious if I will have an issue.