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Author Topic: Anyone shifting to neutral on downhill to save gas ? Back to Topics
Vibe03

Veteran Author
Toronto

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Message Posted: Jul 21, 2010 9:12:55 AM

When it is not steep downhill and you don't need to brake the car to slow it down, coasting down around 55 mph at idling gives the engine a rest also save gas. Just not sure if the vacuum and other stuff are operating at normal level
REPLIES (newest first) Post a Reply
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contiki
Champion Author Ontario

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Message Posted: Apr 19, 2014 7:31:48 AM

Never........
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dassfg
Champion Author Fort Worth

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Message Posted: Apr 18, 2014 7:56:46 AM

No
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contiki
Champion Author Ontario

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Message Posted: Apr 18, 2014 7:31:53 AM

Never........
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gaspleezthx
Rookie Author Seattle

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Message Posted: Apr 17, 2014 3:54:24 PM

That seems silly.
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contiki
Champion Author Ontario

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Message Posted: Apr 17, 2014 7:11:27 AM

no.....never............
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contiki
Champion Author Ontario

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Message Posted: Apr 16, 2014 7:02:09 AM

Never......
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Quick68
Champion Author Columbus

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Message Posted: Apr 15, 2014 9:17:13 PM

It would have to be a very long hill.
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FocusSVT
Champion Author Toronto

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Message Posted: Apr 15, 2014 3:58:31 PM

drydem

Like your post - very educational and good sound advice

Have been following this link and learnt a lot and saved a ton of gas
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LilyAndreita
Rookie Author New York

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Message Posted: Apr 15, 2014 8:22:13 AM

No
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b899
Champion Author Connecticut

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Message Posted: Apr 15, 2014 8:14:23 AM

no
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hoopitup2000
All-Star Author Virginia

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Message Posted: Apr 15, 2014 7:01:40 AM

Rarely . . .
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contiki
Champion Author Ontario

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Message Posted: Apr 15, 2014 6:32:47 AM

Never........
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deant99
Champion Author Ontario

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Message Posted: Apr 13, 2014 8:31:44 PM

good old Mexican Overdrive, haven't done that since my truck driving days
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ace12012
Champion Author Phoenix

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Message Posted: Apr 13, 2014 4:11:30 PM

no.
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cougfanSC
Champion Author South Carolina

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Message Posted: Apr 13, 2014 1:45:49 PM

no
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contiki
Champion Author Ontario

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Message Posted: Apr 13, 2014 7:24:20 AM

Never.........
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d_clark
Champion Author Grand Rapids

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Message Posted: Apr 12, 2014 11:21:29 AM

no
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drydem
Sophomore Author Maryland

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Message Posted: Apr 12, 2014 10:27:30 AM

It's illegal going downhill in many jurisdictions in the USA but most jurisdictions still donot outlaw/ban going uphill or on a flat road surface with the transmission neutral. In that scenerio, the driver must allow the vehicle to slow down as it goes uphill or go slower it travels further across a flat road surface. To go neutral uphill the vehicle has to build extra momentum/speed at the bottom of the hill and the road has to be really smooth ( it also helps if the vehicle is design for low rolling resistance and the road surface is dry ) for a successful scenario think of a Mattel/Hot Wheels toy die cast car doing down hill and then uphill again on a straight race track.

If the car is a hybrid with a electronically controlled CVT with stop start idle technology (think Prius or Fusion hybrid) or if it is an electric car like the Nissan Leaf - then coasting in neutral is pretty safe at speeds under 45 mph because the hydraulic brakes and power steering are still active when in neutral and the engine and transmission can be started and engaged in less than 1/2 second. Why 45 mph? Why 1/2 second? It's based on a driver's ability to react at 45 mph withing 1 second. Going any faster means less time to switch over to to power mode - unlike a hot wheels toy - your vehicle won't likely survive a crash.


[Edited by: drydem at 4/12/2014 10:36:24 AM EST]
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trsmith8
All-Star Author Arizona

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Message Posted: Apr 12, 2014 10:05:41 AM

No
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dgsteven
Champion Author Los Angeles

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Message Posted: Apr 12, 2014 8:44:15 AM

no
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contiki
Champion Author Ontario

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Message Posted: Apr 12, 2014 7:35:47 AM

Never.........
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Birkut
Veteran Author Quebec City

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Message Posted: Apr 12, 2014 5:54:47 AM

No, it is an unsafe practice.
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contiki
Champion Author Ontario

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Message Posted: Apr 11, 2014 7:12:52 AM

never...........
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mybigtruck
All-Star Author San Jose

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Message Posted: Apr 10, 2014 12:16:23 PM

In a diesel, by definition, I consume no fuel when coasting down a hill while in gear.
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Boyrr
Champion Author Allentown

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Message Posted: Apr 10, 2014 10:58:57 AM

nope, I have an auto shift.
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dontuknowOH
Champion Author Ohio

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Message Posted: Apr 10, 2014 8:35:50 AM

@ Boyrr ; Seems you may be driving with you seat reclined too far back and maybe too low at the seat bottom. My brother-in-law drives a med size truck and he complains about the seating position as too low to the windows, uses a pillow cushion always but He is not below average in height.

He loves the truck's exterior looks stature and physical size, economy, but it just doesn't fit him for interior physical design, I tried it at 6'3" and feel the same as he does and because of that, economy would suffer. I just wouldn't care to even drive it at all= no mileage total. LOL!
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contiki
Champion Author Ontario

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Message Posted: Apr 9, 2014 6:57:59 AM

Never...........
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Boyrr
Champion Author Allentown

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Message Posted: Apr 9, 2014 6:30:03 AM

it doesn't work for me, it seems i'm always going uphill, both ways.
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stoihor
Champion Author San Bernardino

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Message Posted: Apr 8, 2014 11:16:13 PM

no.
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StArrow68
Champion Author Oakland

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Message Posted: Apr 8, 2014 9:55:48 PM

Two trips over the Bear Tooth pass but have to admit, no coasting, wonderful drive to break in a new Corvette.
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xbAG
Champion Author California

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Message Posted: Apr 8, 2014 8:55:58 PM

no
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dontuknowOH
Champion Author Ohio

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Message Posted: Apr 8, 2014 10:42:18 AM

No hill travel lately just down-grades, been lucky on those green lights lately. Picked N... for a few longer stops, traffic backed-up for accidents, seems excess speed and no travel (vehicle-to-vehicle endeavor
distance) is rampant daily everywhere? Nicer clear days an a big GEESH! ! ?
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WEDDY
Champion Author Phoenix

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Message Posted: Apr 8, 2014 10:03:39 AM

No
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FieroGT
Champion Author Twin Cities

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Message Posted: Apr 8, 2014 7:35:50 AM

Not me!
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hoopitup2000
All-Star Author Virginia

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Message Posted: Apr 8, 2014 7:03:58 AM

Rarely . . . .
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contiki
Champion Author Ontario

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Message Posted: Apr 8, 2014 6:47:12 AM

Never.......
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jimmy544
Champion Author Boston

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Message Posted: Apr 7, 2014 11:17:36 AM

A couple of places come to mind. I-90 where it crosses the Columbia river in WA(10 miles of coasting) and Beartooth pass in Montana. (16miles of coasting). I am sure there are many others too.
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weddy11
Champion Author Phoenix

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Message Posted: Apr 7, 2014 10:14:09 AM

No
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contiki
Champion Author Ontario

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Message Posted: Apr 7, 2014 6:44:15 AM

Never........
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randy3116
All-Star Author Tennessee

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Message Posted: Apr 6, 2014 10:07:24 AM

only when there is no possibility of any type of traffic around me at all; my record for coasting is 5 miles
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jimmy544
Champion Author Boston

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Message Posted: Apr 6, 2014 9:44:34 AM

It can be done safely if you still have braking and steering. If the car is dependent on the engine running for these you probably cannot do this safely. Back in the 70s I did this to save gas but the truck I had did not have power steering or brakes and the ignition switch did not lock the steering.
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dassfg
Champion Author Fort Worth

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Message Posted: Apr 6, 2014 8:31:39 AM

Dumb to do - why is this question still on here?
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tklsr
All-Star Author Akron

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Message Posted: Apr 6, 2014 7:49:15 AM

no
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RalphHightower
Champion Author South Carolina

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Message Posted: Apr 6, 2014 7:33:17 AM

no
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b899
Champion Author Connecticut

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Message Posted: Apr 6, 2014 7:23:55 AM

no
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contiki
Champion Author Ontario

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Message Posted: Apr 5, 2014 7:17:50 AM

Never.....
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dassfg
Champion Author Fort Worth

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Message Posted: Apr 4, 2014 2:58:47 PM

NO
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b899
Champion Author Connecticut

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Message Posted: Apr 4, 2014 11:16:08 AM

no
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contiki
Champion Author Ontario

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Message Posted: Apr 3, 2014 6:48:01 AM

Never........
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dontuknowOH
Champion Author Ohio

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Message Posted: Apr 2, 2014 10:09:33 PM

Yes just on slight down-grades and up to several red lights, never bothered to track the spedo.. mileage, but managed to stay at a steady zoned speed guessing nearly three miles, by extending my vehicles momentum.

Only with the daily driver, is there a benefit 0n a warm day and the momentum sustained, with no tranny coupled pushing energy used up during red light stops or near stops. As a fact I did catch three reds to idle in neutral, traffic was light today.....!?

The truck doesn't benefit going N... only as when breaking to a stop and at idle before then resuming motion once again. Depends on the amount of accessories being used during the idle intervals (V/8 engine). The wind direction can also be a + or - for a N.... momentum or drop in speed ETC.
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