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Old 04-27-2011, 11:49 AM   #8 (permalink)
UFO
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Join Date: Sep 2010
Location: Denver, CO
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Colorado - '17 Chevrolet Colorado 4x4 LT
90 day: 23.07 mpg (US)
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It's not the altitude. I would expect you would get better mileage with a manual, as I get mid-40s mpg with my automatic Beetle in Denver. Maybe your thermostat is worn, when my coolant was down at 160F I struggled to get 40mpg, that's 10% worse mileage.
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