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Premium does no benefit if your car doesn't require it. Higher octane definitely doesn't increase mileage.
However Ethanol has less energy than gasoline. E10 has 10% of this. So every ten gallons of fuel, you are putting in one gallon of ethanol.
Older cars like mine don't know what to do with ethanol in their system. Newer flex fuel cars can sense when ethanol is present and change accordingly.
As it has been stated....hard to measure the difference without tight control over the test.
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