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Don't get me wrong, I agree that definately you need a guaged A-B-A test, but for basic ecopimps like me, My tests consit of "tank-flush-tank-flush tank" testing. "A" being the first non-modified, "B" being modified, "A" being non-modified. The variables are infinite, but I always seem to get improvement when testing a modification throughout these tanks of fuel.
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