* Fuel injectors: Ethanol can corrode and damage rubber and plastic parts within the fuel injectors.
* Fuel pump: Ethanol can damage the seals and components of the fuel pump.
* Fuel lines and hoses: Similar to injectors, ethanol can degrade these parts.
* Engine seals and gaskets: Ethanol can cause swelling or deterioration of rubber seals and gaskets.
In short, using E85 in a 2000 Ford 5.4L Triton will almost certainly lead to costly repairs. Stick to regular gasoline as specified in your owner's manual.