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I always run 91 for 2 reasons, 1 to get better mileage and 2 for temperature.
I would not put 87 in my lawnmower.
At over $3.00 a gal. in So. California 10 cents is a low percentage and with getting more mpg it's a no brainer for me.
This is an average and every time I get on the freeway I have fun, If I take it easy I read 24 mpg average.
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