Ah, ethanol free. Totally on board with that as I have owned a carpitated car before. I do believe the ethanol accelerates corrosion as it is hygroscopic. The van I rekindled a year or so ago was nearly empty on both tanks, yet no rust in the factory one that I dropped to check. I think the PO had them filled with gas and then drained them before he sold it to me. No way the thing sat for twenty some years with a miniscule amount of gas in both tanks with no rust. That reminds me, the '69 Fury I once owned, that hadn't been on the road since 1981 or 1979. It's original gas tank was a rusty mess. So yeah, the van must've been left sitting full of gas.