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I do have a grill block. I don't think less ice buildup had anything to do with heat, but more to do with aerodynamics. There were equal amounts of ice from slush being thrown up by the tread, just less around the edges of the wheel well, and I think it's because the air is somewhat cleaner because of the pan cap. Where the air is most turbulent is at the rear, and subsequently that's where the most dirt collects. Not as much ice, because on this trip most of the moisture was on the ground and kicked up by the wheels. And the air temp was low enough so that the snow in the air didn't collect at the rear of the van as much.
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