Is this possible? +1.4 mpg gain

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As per my owners manual for my 1998 Maxima says that you may
use 87 octane but 91 is recommended for better performance.
My wifes 2003 Corrola runs smoother and gets slightly
better mileage on 89 + .5 MPG. This I determined after
5 tankfuls of each grade. Premium in this car is a overkill
 
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