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Old 06-08-2014, 02:04 AM   #16 (permalink)
Frank Lee
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Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
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Both a/ts and m/ts have plenty of gears, shafts, and bearings which continue to spin if the vehicle is coasting whether it's in neutral or not and whether the engine is on or off and whether the clutch is engaged or not. The exceptions are those very uncommon vehicles that can freewheel. I'm not sure, but I suspect that if the only variable is if the transmission is auto or manual, the coasting distances would be very similar.

I'm wondering what prompted the question and what will we do with the answer?

Many but not all a/ts should not be coasted extended distances with the engine off due to lack of transmission lubrication. Most m/ts are splash lubricated; the simple fact that bits are spinning in the oil lubricates them and no pump is required. So if I wanted to do extended coasting- presumably the reason I want to coast in the first place is to have the engine off to save fuel- I'd prefer to have a m/t.

Clutch in or out makes no difference whatsoever because it is on the wrong end of the transmission for disrupting the transmission-to-wheels connection.
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