Sorry, my source isn't internet. I was a chassis/cooling engineer for Chrysler for over 10 years before leaving the Detroit area. When we needed to adapt to the blended fuels, we had to change our rubber compounds and go to stainless steel lines. We were already at plastic tanks by that time. Choose to listen, or not. That's your call, makes no difference to me. But I can assure you that automotive OEM's do not spend money to upgrade components unless it is absolutely needed.

The issue with the carbon steel lines and tanks is that ethanol absorbs moisture which obviously is an issue with plain steel. As for the rubber, this isn't new information. Racers have had to use differnt gaskets and accelerator pump materials when running alcohol. Its the same principle. We're just now talking ethanol instead of methanol.

So this isn't hear say. I'm just sharing my experiences with the group.