A good starting point for using the shift adjustments is using the SC setting. This gives you a chance to see the middle setting of the tuning.
So you can adjust higher or lower based on your driving habits.
The shift adjusments do not effect MPG.
The more power added the less one would have to be into the throttle to acheive the sames speeds= less fuel used.
91 octane no towing, light throttle, no excessive speeds.
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