When the engine is cold, you can induce fuel cutoff going downhill using the paddles to down shift, when the footbrake alone would still mean an idling engine.
It's debatable whether this will actually save much fuel as you'll be warming up more slowly.
It's counterintuitive, but in hilly areas using the paddles to keep rpm high on long uphill stretches can prevent a forced regen later thereby sparing fuel overall.
Unfortunately, 7th gear gives higher rpm at highway speeds than leaving the car in CVT (which I wish wasn't the case). This it's likely to mean lower mpg potential at high speed on flat roads than of you left the car in D.
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