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^This, and often they do different things with them. Like the automatic Mustangs come with a LRR (for the vehicle) tire, vs the standard with non LRR tires.
Keep in mind it's not just the final drive, but the testing procedures of driving it. Running by the EPA cycle, the auto may be better (subjective shifting for the standard), while two side by side on the road could show better (for the standard) or the same when two people drive under the same conditions.
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