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4X4 Auto use more Gas?

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Old 01-05-2009, 10:57 PM
clearnetedm clearnetedm is offline
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4X4 Auto use more Gas?

On the 08 Expy does the system engage extra parts when the system is on the auto 4X4 mode even though your driving on dry paved roads? I'm just wondering if leaving in Auto everywhere would decrease fuel mileage?
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Old 01-20-2009, 11:29 PM
2001gocougs 2001gocougs is offline
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Using the 4x4 auto will decrease the mileage because of increased resistance from the gears being aligned and turning and occasionally even on dry payment the system will turn all four wheels versus driving in two wheel drive mode.
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Old 01-21-2009, 05:08 PM
pitrow pitrow is offline
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You won't notice a significant difference.
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Old 01-21-2009, 08:21 PM
montecarlo31 montecarlo31 is offline
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no noticeable difference on 2500 suburban in 4 auto, silverado in 4 auto and expedition in 4 auto. I find it highly unlikely you'll see any difference. Now, if it's rainy/snowy your fuel economy will go now no matter what.
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Old 01-26-2009, 08:08 PM
chuck s chuck s is offline
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I can feel the drag difference in 4Auto vs 2High so I leave it in 2High 98% of the time. Rain and snow she goes to 4Auto just 'cuz. The drag has gotta use more fuel and cause more wear.

My Explorer runs in 4Auto all the time, no 2High choice.

-- Chuck
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