Ca fuel? Awk! It used to have MTBE, whatever that is, and it would eat tank slosh - but not digest it.
I run very small Stromberg carbs, and can tell you that California gas doesn't seem to harm them. It also doesn't seem to bother my ancient Mustang convertibles, and has no effect on dope, acrylic enamel, or poly tone. I cannot tell you that I use gas with alcohol in it, because that would be an admission of guilt, at least in airplanes not certificated experimental.
But I have had my Cub in California since 1967, and fly it every darn day. So far, so good.