A very informative report just came out regarding the ethanol/gasoline blended fuels. Typical of a government programs, the original reason for the program is lost and warped, somewhere between Energy Independence and Security (US Energy Independence and Security Act, passed in December 2007) and "green" low emission level fuels, with the EPA citing both needs as the reasoning, but with no mention of the "corn farmer lobby", in the NY Times article.

Here - http://green.blogs.nytimes.com/2012/05/16/a-new-skirmish-in-the-ethanol-wars/?hp

Here's the report itself, lots of good information in it - http://www.crcao.com/reports/recentstudies2012/CM-136-09-1B%20Engine%20Durability/CRC%20CM-136-09-1B%20Final%20Report.pdf

Of course, even the agencies can't figure out what's what, whether E15 is harmful or okay, since they said it was okay a year and a half ago - http://yosemite.epa.gov/opa/admpress.nsf/0/BF822DDBEC29C0DC852577BB005BAC0F

Not to get too political, the main reason for posting is the effects on the engine and the tune. Ethanol leans out the fuel, so the more they add the leaner the older "open-loop" EFI systems and carbs will get. Plus more wear on the valves and valve seats. Can't wait...

It's gonna be a mess.