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Good info to know. All I know is that when I coasted in gear with my 2005 WRX my IDC was 0% and my calculated mpgs were always better than if I coasted in neutral. That's a habit I carried over to my STI and now to the BRZ as well. I'm returning ~30-32mpg in the BRZ going mostly 70mph on my commute (90 miles round trip per day).
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