A post submitted by CGI member Morgan.

CGI is RMN's reader's forum.

And for those who don't know:

What is E15 petrol?
Image result for E15 petrol
E15 contains 15% ethanol and 85% gasoline. This is generally the highest ratio of ethanol to gasoline that is possible to use in vehicles.
https://en.wikipedia.org/wiki/Common_ethanol_fuel_mixtures

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IT DESTROYS OLDER CARS.

IF DOOMED TO BE STUCK WITH E15 PETROL AND YOU HAVE AN OLD CAR. . . WHAT'S CHEAPER? GET ANOTHER CAR OR SEEING IF ENGINE TRANSPLANT IS VIABLE? THINK ABOUT IT.

Morgan

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Test on 2001 - 2009 models

Big Surprise - New Study Finds E15 Engine Damage

Their results? Two of the eight engines running on E15 had lower performance and lower fuel economy and suffered valve damage. A third engine also saw its emissions increase, which is not supposed to happen with E15.

As you may expect, auto industry decison-makers (who don't really like ethanol) really trumpeted these results, while ethanol industry people rushed to poke holes in it. The study authors, the CRC, themselves called into question the rationale of the EPA approving E15. According to their comments, they think the EPA rushed to judgement and were too reliant on the results of one study by the Department of Energy that demonstrated E15 being safe for catalytic convertors.
https://www.bellperformance.com/blog/bid/106227/Big-Surprise-New-Study-Finds-E15-Engine-Damage

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E15 Gas Is Bad For Boat Engines

Ethanol fuel can ruin your marine engine
A Verado 300 piston (top, left) that ran for 300 hours on E0 fuel looks good. The piston from the failed engine (above, right) has heavy carbon deposits, a sign of excessive heat in the combustion chamber. Courtesy Mercury Marine

“E15 has not been ­approved for these types of engines because significant catastrophic engine failures have occurred as a result,” says Jeff Wasil, engineering manager of emissions testing at BRP/Evinrude.

https://www.boatingmag.com/e15-gas-is-bad-for-boat-engines/