Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-11-2008, 06:35 AM   #11 (permalink)
EcoModding Lurker
 
Join Date: Jun 2008
Location: Manila, Philippines
Posts: 18

Lancer - '00 Mitsubishi Lancer GLX
90 day: 30.28 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
unfortunately, my engine is a carb engine

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-11-2008, 07:18 AM   #12 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,859

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,361
Thanked 2,864 Times in 1,802 Posts
Hello,

Really? A carbureted engine in 2000? I thought that the last carbureted vehicle sold in the USA was the Izuzu P'Up?

Oh wait, you are in the Philippines.

Sure -- then idling the motor and using your brakes is going to be the best way to save fuel.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 07-16-2008, 09:48 AM   #13 (permalink)
EcoModding Lurker
 
Join Date: Jun 2008
Location: S. Florida
Posts: 1

Big Red - '02 Saturn Vue AWD
90 day: 20.11 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
I just added a scangauge to my 2002 Saturn Vue. In neutral it shows the throttle position as 1. As soon as I put the car in drive the TP goes to 2. When sitting at a light, you can see the MPG drop steadily about .1 MPG per 15 seconds when in drive. In neutral, the MPG drops .1 per 30-40 seconds. The instant mpg indicates approximately 50% higher when coasting in neutral than in gear.

Jay
  Reply With Quote
Old 07-16-2008, 10:40 AM   #14 (permalink)
Box Dreamer
 
Join Date: Jul 2008
Location: Pittsburg, CA
Posts: 154

xB Commuter - '04 Scion xB
90 day: 40.76 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
I had this question before when I know coasting in gear cuts the fuel above certain rpm. Which technique is better in which situation? My conclusion is following the traffic!! Use coasting in gear technique as engine brake to control the speed. Your safety is #1, other safety is #2, mpg is #3.
__________________
  Reply With Quote
Old 07-16-2008, 10:55 AM   #15 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,313

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 604
Thanked 422 Times in 277 Posts
I try to keep a buffer so I never have to use the brakes or do engine braking in traffic. There's definitely an art to it, but it's generally possible. That makes the choice much easier - use neutral.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 07-17-2008, 12:20 AM   #16 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2008
Location: Des Moines, IA
Posts: 152

Oden - '00 Nissan Frontier Crew Cab
Pickups
90 day: 14.93 mpg (US)

Nerdcycle - '81 Honda CM400E
Motorcycle
90 day: 61.16 mpg (US)

Bumblebee - '08 CF Moto V3
Motorcycle
90 day: 69.17 mpg (US)

Betty - '11 Honda Pilot Touring
90 day: 15.94 mpg (US)

Trouble - '06 Kawasaki Ninja
90 day: 74.69 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Art nothin'!

Quote:
Originally Posted by PaleMelanesian View Post
I try to keep a buffer so I never have to use the brakes or do engine braking in traffic. There's definitely an art to it, but it's generally possible.
It depends entirely on the other vehicles in traffic. Around here, if I leave a buffer of more than two car lengths some jerk merges into it!
__________________

  Reply With Quote
Old 07-17-2008, 10:37 AM   #17 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,313

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 604
Thanked 422 Times in 277 Posts
2 car lengths isn't much of a buffer. A single jerk can cut it in half, like you said. Now 10 car lengths... a single jerk takes out only 10% of your buffer.

It is possible. I've driven in Houston, Dallas, Chicago, San Francisco and San Diego in recent months. It's harder in busy cities, true, but it's still possible.

... and in my experience, the jerks that jump into your buffer are just as likely to jump back out a few seconds later.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles

Last edited by PaleMelanesian; 07-17-2008 at 11:18 AM..
  Reply With Quote
Old 07-17-2008, 11:24 AM   #18 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2008
Location: Des Moines, IA
Posts: 152

Oden - '00 Nissan Frontier Crew Cab
Pickups
90 day: 14.93 mpg (US)

Nerdcycle - '81 Honda CM400E
Motorcycle
90 day: 61.16 mpg (US)

Bumblebee - '08 CF Moto V3
Motorcycle
90 day: 69.17 mpg (US)

Betty - '11 Honda Pilot Touring
90 day: 15.94 mpg (US)

Trouble - '06 Kawasaki Ninja
90 day: 74.69 mpg (US)
Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by PaleMelanesian View Post
2 car lengths isn't much of a buffer. A single jerk can cut it in half, like you said. Now 10 car lengths... a single jerk takes out only 10% of your buffer.

It is possible. I've driven in Houston, Dallas, Chicago, San Francisco and San Diego in recent months. It's harder in busy cities, true, but it's still possible.

... and in my experience, the jerks that jump into your buffer are just as likely to jump back out a few seconds later.
I was using that as the low end extreme, meaning that's all it takes before someone jumps my buffer. If I leave a buffer of 3 car lengths, two jerks will jump in. 4 lengths, and I get 3 jerks and so on. That's just my experience. Also, my commute purposely avoids the freeway, so I'm talking about 4 lane, one way 35MPH speed limit in which everyone is going at least 40.
__________________

  Reply With Quote
Old 07-17-2008, 01:32 PM   #19 (permalink)
EcoModding Lurker
 
Join Date: Jun 2008
Location: Glassboro, NJ
Posts: 88

Kawi - '04 Kawasaki Vulcan 800 Classic
90 day: 56.48 mpg (US)

The Monte - '99 Chevrolet Monte Carlo Z34
90 day: 26.52 mpg (US)

Mazda - '10 Mazda 3i
90 day: 35.15 mpg (US)
Thanks: 0
Thanked 0 Times in 0 Posts
This is all very foreign to me. I have a motorcycle with a carb on it. So I'm not understanding how engine braking can give you better fe than coasting in neutral. Maybe it's just me, but I've coasted a lot using engine braking (before I knew what ecodriving was) and a lot just in neutral, and just by listening to the sound of the engine you can notice a huge difference in RPMs when engine braking. Is this something on newer cars? I had a '07 Dodge Caliber and it seemed about the same results. If fuel is usually cut off from the engine during engine braking, how does it continue to run?
__________________
Goal one= 30mpg on The Monte by changing the nut that connects the steering wheel to the seat.

  Reply With Quote
Old 07-17-2008, 01:43 PM   #20 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,313

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 604
Thanked 422 Times in 277 Posts
Carburetors usually don't do fuel cut. In that case, Neutral is the best option, period.

On cars with fuel cut programmed in, it's the wheels driving the engine. Just like the engine driving the wheels in normal operation. There's a direct (through gears and all) connection between the pistons and the wheels. When you let off the throttle, the car's momentum will keep the wheels turning. That, in turn, drives the engine. It'll keep turning whether or not there's any fuel burning, so why use any? The control unit turns off the injectors.

__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Coasting in gear vs. neutral (fuel cut feature) WTFM8 Hypermiling / EcoDriver's Ed 28 05-29-2011 10:39 AM
Neutral coasting vs In-Gear coasting Netherby Hypermiling / EcoDriver's Ed 1 06-13-2008 11:53 AM
Any Big Savings In Coasting In Neutral With Engine On? dsq Hypermiling / EcoDriver's Ed 25 06-12-2008 11:39 AM
Experiment: EV coastdown in gear vs. neutral (in the ForkenSwift) MetroMPG Fossil Fuel Free 6 03-17-2008 10:12 AM
Coasting experiment: engine on VS engine off on a fixed route = 12.9% gain MetroMPG Hypermiling / EcoDriver's Ed 6 02-22-2008 08:38 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com