Anything made prior to model year 2012 is not setup to run e15. Anything carbureted will clog up and require disassembly and cleaning at a minimum if left too long between starts. It corrodes any steel it stays in contact with, due to water content, think fuel lines, pumps, etc.
Guess if one upgrades their vehicles every few years its no concern, but those of us who enjoy and sport the antiques must fight the taxpayer funded support of e15 fuel being forced on all of US...