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Grille block success
I recently blocked the area below the front bumper and above the chin spoiler (if you can call it that) with round foam pipe insulation. After 2 tanks it seems to have made a significant difference in economy. No official tests, but the last trip i did looks to be 44 MPG at 20 deg F, which is quite a bit higher than the 38-41 MPG I usually see in the winter. It also warms up nearly a mile quicker from a 10 deg F startup. I think the front bumper, which sticks out far (on this old design) previously trapped the air deflected up by the chin spoiler, funneling loads of freezing air into the engine. I think a lot of gas can be saved by really sealing up the front in really cold temps! (just make sure your engine is running at the right temp, and you havent covered an important trans cooler or something).
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