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I have had a 2010 Enclave for 58000 miles and used all kinds of gas in it. Seems to get best mileage with 89 octane 10% ethanol blend at 1000 ft msl in Iowa summer and winter. I use 87 octane in Colorado at 5000 to 10000 feet. I get about 20 mpg hwy with AWD and travelling at "about" the speed limit. If I slow to 65 it gets about 22 mpg in summer. Not as much difference in winter.

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Q: Can plus gas be used in a Buick Enclave?
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