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I know that there is a guy over on CleanMPG that had it done to two Saturns he and his son own/owned. I trust him on his numbers, and what was being reported was 65-80 MPG tank averages.
I bet it's a "YMMV" thing. I'd love to grab a second head for my car, groove it, and do some A-B-A testing. But that takes time/money, two of the rarest things in my life...
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