Are gas tanks coated with anything?

[736cc_imp]

Ethanol blend fuel absorbs water. The old-school way to store gas was to top off tank w/ gas and add stabil. The new-school way is to add 2 stroke oil and Stabil or Startron to whatever gas is in tank, run the engine a minute or so then it's winterized. Or simply drain tank completely if vehicle is stored indoors. Untreated modern fuels are causing huge problems in boats and classic vehicles w/ carbs and old fuel systems.
Modern gas tanks are not bare metal, they are coated from the factory.