I used a bead of clear RTV for installation.
As soon as it stops raining here I will get a better idea about any FE benefits. In the morning my water temp usually takes 5 minutes to reach 157F. Now it takes 3 1/2 minutes. FE in the first 5 minutes went from 45 to 50MPG. So far the warmest ambient has been 55F and I show no difference in max water temp, 186F.
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