Thread: Grillblock
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Old 10-28-2010, 07:28 PM   #5 (permalink)
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Max - '14 Ford C-Max SEL
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start with the top, that got me .78 MPG and worked fine all summer.
The lower one I would start blocking as it gets cold. If you have a good temp gauge (that you can see when the fan comes on and off) then match the grill block to keep the fan off 95% of the time. If not just go till the lower grill is 60% blocked (dead of winter).
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