I haven't ran the numbers but I wonder if black diamond has the deepest gears for its tire size and if at the test speed it hits the 2.3 at a bad spot in the powerband where it is under boost.This just adds to the confusion. So the 2.7L gets worse MPG than the 2.3 for Base, Big Bend, OBX, but manages to improve for the Black Diamond? Additionally, the Black Diamond gets the same MPG as the sasquatch on 35s for the 2.3L engine?
Its all I can come up with.
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