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Originally Posted by litesong
I've heard that burning 100% ethanol-free gasoline (E0), instead of 10% ethanol blends, helps reduce deposits in DI engines.
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I'm not so sure about it, but it doesn't seem so likely.
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Might the use of E0, instead of 10% ethanol blends, also reduce particulate air pollution?
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I'd also not hold my breath for that. Even though ethanol may be harder to fully vaporize on port-injection engines, with DI it has been possible to avoid pre-heating of the fuel as a cold-starting aid. Trimming the AFR a little leaner at the cold starts might help to decrease the PM emissions in a worst-case scenario.