Mine has been running E-Flex for 3 years now.
Has not missed a beat, has not had a seal broken, has not had any issues with fuel.
ive also had a tank of flex sitting in the car for 8 months and nothing happened... Drained it, put new stuff in.... And off she went again.
No modified anything to "suit"... Standard Lines, Standard Rail.
FIC's...
First pump was Areomotive.
Current Pump walbro 416.
Car is at 30psi on Flex with a gtx3076.
Starts first time everytime, Doesnt miss a beat.
I changed the plugs for the first time in 3 years Last week. I didnt even have too!!! THEY WERE PERFECT.
Ive never changed a fuel filter....
Thats my story..
I know a lot of people have had miss conceptions..