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Going up one hill I'd try keeping the Buick in OD for as long as I could. One day it slowed enough to shift to 3rd, and my mileage went up. The RPM's went from ~1100 to ~1700, and the engine timing started advancing again. I'm guessing the engine was not making enough torque that low to propel the car up the hill.
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2012 Chevrolet Cruze Eco 6MT
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