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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 08-17-2012, 12:24 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Nov 2011
Location: Princeton, NJ
Posts: 28

MLGeo - '95 Geo Prizm
90 day: 33.73 mpg (US)

MLTacoma - '09 Toyota Tacoma
Last 3: 20.97 mpg (US)

MLBRZ - '22 Subaru BRZ Premium
90 day: 27.78 mpg (US)
Thanks: 2
Thanked 6 Times in 6 Posts
Which technique gives better mileage?

Car is 1995 Toyota Corolla, 1.6 l auto, in good condition. Starting gently from a stop, the car shifts up to top gear rather quickly, about 20 mph. I need to reach my normal cruising speed of 51 mph, torque convertor is locked up at that point, and I am in no hurry to go anywhere.

Which would yield better gas mileage ?:

A. from top gear, at about 20 mph, accelerate very slowly, just enough to keep the speedometer rising until I reach my cruising speed. Sometimes this may take up to a minute. Watch vacuum gauge and keep vacuum as high as possible, usually above 5 inches.

B. from top gear, at about 20 mph, accelerate moderately hard, without letting the trans downshift, until I reach cruising speed. Obviously this will happen quicker than one minuet as in scenario A. Watch vacuum gauge, but under this technique the gauge would go to zero.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 08-17-2012, 12:32 PM   #2 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 4,150

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,784
Thanked 1,922 Times in 1,246 Posts
I'd expect B to. Harder acceleration is less acceleration.
__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
The Following User Says Thank You to Fat Charlie For This Useful Post:
roosterk0031 (08-17-2012)
Old 08-17-2012, 12:50 PM   #3 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

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: 611
Thanked 434 Times in 284 Posts
I agree - B is better. BSFC wins.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Old 08-17-2012, 03:31 PM   #4 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
You should do best in an auto by acelerating as fast as possible without delaying transmission upshifts. This gives you the highest practical load, which in turn gives you best BSFC. If you can't stay in top gear (converter locked) then pulse (engine on) and glide. No engine off when moving in an auto, or you could hurt the transmission.

regards
Mech
  Reply With Quote
Old 08-18-2012, 02:28 AM   #5 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,819

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 43.3 mpg (US)
Thanks: 4,327
Thanked 4,480 Times in 3,445 Posts
My guess is also B, brisk acceleration.

I recently played on the back roads, taking the engine to the end of the redline, and I got one of my best mpg scores. Of course, I wasn't touching the brakes for anything, but instead coasted. It didn't seem to affect mpg as much as I thought it would.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 08-18-2012, 07:27 AM   #6 (permalink)
Wiki Mod
 
Weather Spotter's Avatar
 
Join Date: Nov 2009
Location: Midland MI, USA
Posts: 2,042

Max - '14 Ford C-Max SEL
Thanks: 228
Thanked 304 Times in 210 Posts
Quote:
Originally Posted by redpoint5 View Post
My guess is also B, brisk acceleration.

I recently played on the back roads, taking the engine to the end of the redline, and I got one of my best mpg scores. Of course, I wasn't touching the brakes for anything, but instead coasted. It didn't seem to affect mpg as much as I thought it would.
If you engine off coast, then the engine is only working to get you to speed, so the amount of fuel used to get you there is the major factor in MPG, aero being second (first if you go about 50 MPH). hard fast acceleration tend to be at the ~80 load where the engine is most efficient. so your example sounds about right.
I would stop just short of red line though
__________________
  Reply With Quote
Old 08-18-2012, 07:52 AM   #7 (permalink)
The Dirty330 Modder
 
Gealii's Avatar
 
Join Date: Dec 2011
Location: North East Ohio, USA
Posts: 642

CruzeRS - '15 Chevy Cruze LT RS
90 day: 41.29 mpg (US)
Thanks: 10
Thanked 67 Times in 59 Posts
I also would go with B in my auto i seem to get my best mpgs at 70-80% engine load
__________________



"The only real mistake is the one from which we learn nothing."
- Henry Ford
  Reply With Quote
Old 08-18-2012, 06:35 PM   #8 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,819

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 43.3 mpg (US)
Thanks: 4,327
Thanked 4,480 Times in 3,445 Posts
Quote:
Originally Posted by Weather Spotter View Post
If you engine off coast, then the engine is only working to get you to speed, so the amount of fuel used to get you there is the major factor in MPG, aero being second (first if you go about 50 MPH). hard fast acceleration tend to be at the ~80 load where the engine is most efficient. so your example sounds about right.
I would stop just short of red line though
I'll start employing EOC when covering distances of 1/4mi or more. I've been leaving the engine on, but there is no reason to do so in a manual since I can bump start.

I normally accelerate at 85% load and shift at 3000rpm. I'll cruise at around 1500rpm.

The V-Tech kicks in at 6000rpm and the maximum rpm is 7500. I was just playing since I have never seen what my car is capable of. No sense driving a sporty car if you don't have fun with it every now and then.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 08-18-2012, 07:11 PM   #9 (permalink)
Pokémoderator
 
cfg83's Avatar
 
Join Date: Dec 2007
Location: Southern California
Posts: 5,864

1999 Saturn SW2 - '99 Saturn SW2 Wagon
Team Saturn
90 day: 40.49 mpg (US)
Thanks: 439
Thanked 532 Times in 358 Posts
Mcgiiver -

This would have made a great poll :

Quote:
A. from top gear, at about 20 mph, accelerate very slowly, just enough to keep the speedometer rising until I reach my cruising speed. Sometimes this may take up to a minute. Watch vacuum gauge and keep vacuum as high as possible, usually above 5 inches.

B. from top gear, at about 20 mph, accelerate moderately hard, without letting the trans downshift, until I reach cruising speed. Obviously this will happen quicker than one minuet as in scenario A. Watch vacuum gauge, but under this technique the gauge would go to zero.

C. A and B are equal

D. Other
CarloSW2
__________________

What's your EPA MPG? Go Here and find out!
American Solar Energy Society
  Reply With Quote
Old 08-20-2012, 09:20 AM   #10 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 4,150

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,784
Thanked 1,922 Times in 1,246 Posts
Quote:
Originally Posted by redpoint5 View Post
No sense driving a sporty car if you don't have fun with it every now and then.
No, you were being responsible. The gliding deniers keep pointing out how dangerous life is when you're not in gear (if your engine stalls, you lose power steering and the ability to accelerate away from danger). Familiarizing yourself with that safety feature called acceleration is only making you more ready to use it to avoid a hazard.

__________________

Quote:
Originally Posted by sheepdog44 View Post
Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

  Reply With Quote
Reply  Post New Thread






Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com