Not sure if there are any first generation Multi. owners out there that have had swollen gas tanks due to ethanol issues. I have yet to (and I don't want to) experience it, always use ethanol free premium gas when possible, but Chris Kelly from California Cycleworks has posted on facebook looking to see how much interest there is in having a new ethanol impervious tank made for first generation Multis. Anyone interested should have a look.
https://www.facebook.com/californiacycl ... ts&fref=ts