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Old 02-22-2012, 10:17 PM   #4 (permalink)
roosterk0031
Master EcoModder
 
Join Date: Jan 2011
Location: Iowa
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Impala FFV - '10 Chevy Impala LT
90 day: 29.54 mpg (US)

XFE Coupe - '09 Chevy Cobalt XFE
Team Chevy
90 day: 37.71 mpg (US)

Penny's Rogue - '15 Nissan Rogue SL AWD
90 day: 29 mpg (US)

Cam's Rogue - '11 Nissan Rogue SV AWD
90 day: 28 mpg (US)

Elantra - '17 Hyundia Elantra SE
Team Hyundai
90 day: 3.39 mpg (US)

Cruze Limited - '16 Chevy Cruze Limited LT
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Some auto tranny cars benefit from neutral coasting some don't. My 2 gm's coast almost exactly the same drive or neutral. My dodge doesn't it actually downshift during coasting and engine brakes. It goes really smooth N-D above 40, below that speed not so smooth. If it goes smooth N-D I can't see how it can hurt anything. But if it doesn't help your coast it's a wasted effort and possible wear & tear.

I'd always leave OD engaged unless driving a lower speed hilly road where it's downshifting every hill.

Cold air intakes, high flow intakes, basically only change peak-maximum power. Regardless of how easy the air gets thru the filter, the throttle plates restricts airflow down to match what the engine needs to do the task asked of it. If throttle is wide open then intake/filter restriction, cold air denser etc... can make a difference. 1/2 a percent of the time we drive.
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