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New testing, fully warmed vehicle.
-Idling in N shows gph = 0.18
-Idling in D shows gph = 0.22
Quick math tells me I wait at between 6 and 12 minutes worth of lights per day.
So best case savings = 0.2 hours of idle * 0.04 gph delta = 0.008 g/day saved.
At 240 days a year driving this is 1.92 gallons.
Hmmm...doesn't seem at all worth the effort.
I will abandon this method for a few days and check overall mpg for effect.
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