Thanks for posting. It's helpful to have the factory's advice. In addition, and as in the many other times that this has been discussed: 1 Sevens last a long time. Rubber and plastic components in the fuel system might not last as long. Think of them as consumables. 2 Materials approved for use in vehicles have been tested for resistance to ethanol for several decades. But other materials might be used in Sevens in modifications, upgrades and eg DIY gaskets. Jonathan