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Old 11-30-2011, 12:43 PM
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Hillbilly_Hybrid Hillbilly_Hybrid is offline
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Hybrids: GM
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Default Re: MPG Drop since getting Oil Change ???

A 10% drop in fuel economy due to weather is not unusual. The oil if heavier viscosity will increase friction but not as much as the cold on aero drag, tires, and running gear.
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