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It depends on several things like what type of transmission , what diff gear , what tire and the condition of each of these items . I have always been told most stock type autos with tighter convertors use around 14-18% while most 5 and 6 speed designs use about 6-10% . I have heard that Tremec said the T56 in new form uses as little as 2% from their research . I cannot confirm this though .
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