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Must be your stage of tune
Posted by nwas (more from nwas) on Tue, 15 Sep 2009 13:11:45
In Reply to: Fuel economy rose after switching to ethanol!, Steven Pfaff, Sun, 13 Sep 2009 11:00:59
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When they switched to 10% ethanol in my area (all stations), I noticed a drop in fuel economy.
The octane issued raised is valid, but if they are rating gas they way the traditional test manuals read, then the 10% alcohol is already factored in to get the octane rating on the pump. So, 93 octane is still 93 octane max, not 93 octane gas with a boost from alcohol. You just end up with the less efficient alcohol taking up space and lowering milage.
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