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Old 03-16-2012, 11:35 AM   #4 (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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You shouldn't see much reduction in mileage, it's just a lighter grade of fuel. However you would benefit from a lubricity additive, as #1 tends to be drier (although if it's diesel fuel, it should meet minimum standards.)
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