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A remap could use more or less fuel depending on how it was mapped and how its driven.

Add more power and use that power then your going to use more fuel, add more torque and use that
to use a higher gear where previously it needed more torque then you could save fuel.

With an auto you have the added complication that will the gearbox ECU know how to take the
best advantage of the extra power or torque.
 
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