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...back to my 'original' point, which is:
1) EPA tests with 100% gasoline, not E10 <--- stated by others.
...and...
2) EPA tests with 91 octane fuel, not 87 octane which MOST engines are specified to use by their manufacturers.
...and, because most current engines can "adjust" operating conditions (ala' knock sensor) to achieve "optimum" results with varying fuel charactoristics (and thus performance)...the EPA tests are using higher-milage 'capability' 91 octane, not the lower 'capability' 87 octane that most people follow.
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