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Idle is where you'll see the biggest improvement % wise if your engine doesn't start stumbling. I saw 10% fuel economy increase from going 10% leaner (MAF reading stayed identical, but AFR was leaner) on my FR-S. The 12.5 compression ratio and stratified charge from the direct injector probably help make that possible.
Turning the air conditioner on in neutral, the MAF reading also barely went up at all, so I was saving another 10% on the marginal fuel usage of the air conditioner.
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