My first tank without it came to around 25 MPG, so it may have some effect after all. The temparatures cooled and more rain came around after I installed it, so it might have evened out the drop in FE.
I had to fill with E10, though, because the price of unblended premium is 50 cents a gallon more than E10 regular, and it's no longer cost-effective going with the premium.
I might revisit this mod later on.
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In Reason we Trust
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