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I removed the upper and lower grill blocks.
The mpgs went down below the 40's into the 38 mpg range.
By your lead, I constructed a coroplas upper block,
only I cut out the H symbol like were discussed earlier.
I did cover that with the black duct tape I used to hold it on.
The mileage really hasn't recovered.
So I'm going back to the bottom block, and opening the top to get some flow into the radiator, as the temps here are promising to rise.
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