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A friend* with a Yaris, who commutes up and over a 5,000 foot mountain pass, tested this. He got the best results with regular. Mid was a little worse, and premium was almost 5% lower mileage.
*bailout on cleanmpg
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- - - - -Best 11-mile commute: 105 mpg
- - - - -Best tank: 88.5 mpg / 1133 miles
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