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Well... a tank done with the shield in. Not a huge difference, but seems better by a bit than the previous.
16.6 mpg.
It's not a huge jump, but I'm going to just go by the thought that in the summer in these 90* days, it's worth it to have. Especially if I would be towing etc.
In the winter... take it out! Get that HAI going.
I will test with another full tanks, as it's above 80 for the rest of the week as well.
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