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Originally Posted by Lazarus
That's not necessarily true. MN is going to E20 soon. Brazil has had E20 for a long time. I've seen and have seen others get increase in FE with mixtures of E15. Here's a thread on it also check out this page.
You'll be fine with the a couple of gallons of E85 but if the mixture gets over E50 the mileage does start to drop pretty quickly. |
I'm not sure at what point any given manufacturer says damage might occur. However, most say 10% is safe on standard EFI, and no more. Flex-fuel vehicles are designed to use 15%.
As for efficiency, the EPA and Consumer Reports agree, Ethanol sucks FE, as compared to gas. No major study that I know of says otherwise. No scientist alive claims that gas has less usable energy than ethanol, or that ethanol is superior in energy storage and/or release.
As for what people on threads say, there are people who say they are running their cars on water, orange juice or coffee. I really don't have much confindence in what they say, for scientific reasons.
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However, a standard EFI gasoline engine can typically only tolerate up to 10% ethanol and 90% gasoline. Higher ethanol ratios require either larger-volume fuel injectors or an increase in fuel rail pressure to deliver the greater liquid volume needed to equal the energy content of pure gasoline.
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http://en.wikipedia.org/wiki/Ethanol