Quote:
Originally Posted by Nerys
My timing is already advanced as much as I can without more severe pinging (or whatever the noise is)
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That's because when you wash out the ethanol, you are left with gasoline with crappy octane. If you advance your timing, you should be able to take advantage of the octane in the ethanol and operate your engine in a manner it was designed. You might see a significant mileage increase.