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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-23-2013, 03:20 PM   #31 (permalink)
Master EcoModder
 
Join Date: Jan 2012
Location: United States
Posts: 1,282

spyder2 - '00 Toyota MR2 Spyder
Thanks: 78
Thanked 221 Times in 163 Posts
Quote:
Originally Posted by kennybobby View Post
3500 rpm at 70 mph => 2750 rpm at 55 mph. Would the load be so much better at 3500 rpm as to overcome the additional aero drag power and still beat the 2750 rpm BSFC?
Nope, the only time going faster saves gas is around idle, where engine efficiency starts getting really poor. Efficiency increases kind of linearly (then falls) with load, but the torque required to go faster increases as a quadratic function of speed.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-13-2014, 07:37 PM   #32 (permalink)
Intermediate EcoDriver
 
Mustang Dave's Avatar
 
Join Date: May 2009
Location: Northern Arizona - It's a DRY cold..
Posts: 659

Trigger - '07 Ford Mustang V6 Premium Coupe
Team Mustang
Sports Cars
90 day: 32.51 mpg (US)

Big Red (retired) - '89 Ford F-250 4wd Custom
90 day: 18.13 mpg (US)

Big Red II - '13 Ford F-150 FX4
Pickups
90 day: 18.99 mpg (US)
Thanks: 155
Thanked 121 Times in 94 Posts
Quote:
Originally Posted by serialk11r View Post
Nope, the only time going faster saves gas is around idle, where engine efficiency starts getting really poor. Efficiency increases kind of linearly (then falls) with load, but the torque required to go faster increases as a quadratic function of speed.
I proved last weekend that a 4-Liter Ford Mustang can get better than 34 MPG just by limiting freeway speed to 65 MPH. Most (non ecomodder) people are incapable of such results.
__________________
Fuel economy is nice, but sometimes I just gotta put the spurs to my pony!



Quote:
Originally Posted by thatguitarguy View Post
Just 'cuz you can't do it, don't mean it can't be done...
Quote:
Originally Posted by elhigh View Post
The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
  Reply With Quote
Old 07-13-2014, 08:14 PM   #33 (permalink)
Ol' Skooler
 
jcp123's Avatar
 
Join Date: Jul 2009
Location: Tyler, TX
Posts: 1,134

Beater Echo - '00 Toyota Echo
Team Toyota
90 day: 42.67 mpg (US)

Hondizzle - '97 Honda Civic DX
Team Honda
90 day: 46.77 mpg (US)
Thanks: 60
Thanked 185 Times in 158 Posts
My conversion van was the only vehicle which has ever given evidence that higher speed may be helpful...best tank ever was a stretch doing 70mph. Unscientific but...that's all I got.
__________________



'97 Honda Civic DX Coupe 5MT
'00 Echo - dead 2/17
'14 Chrysler Town + Country - the better half's car
'67 Mustang Convertible - gone 1/17
  Reply With Quote
Old 06-17-2015, 05:22 PM   #34 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,238

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 52.8 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 73.57 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 55.99 mpg (US)
Thanks: 2,988
Thanked 5,877 Times in 3,046 Posts
widespread manual transmission advantage

In a study by the AAA of how closely drivers' real world fuel economy matches vehicle EPA estimates...

Quote:
Owners with cars equipped with manual transmissions enjoyed 17-percent higher real-world results.

...

AAA culled its data from an analysis of 37,000 records submitted to the EPA, and those records contained more than 8,400 vehicle make, model, and model-year combinations.
In the real world, fuel economy diverges widely from EPA estimates
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
The Following User Says Thank You to MetroMPG For This Useful Post:
Xist (06-18-2015)
Old 06-17-2015, 06:58 PM   #35 (permalink)
Master EcoModder
 
jedi_sol's Avatar
 
Join Date: Mar 2009
Location: Tustin, CA
Posts: 929

2013 STi *SOLD* - '13 Subaru Impreza WRX STi
Subaru
Sports Cars
Team Turbocharged!
90 day: 26.59 mpg (US)

1996 Geo Metro *RETIRED from Ecomodding* - '96 Geo Metro Base
90 day: 58.68 mpg (US)
Thanks: 368
Thanked 378 Times in 236 Posts
Quote:
Originally Posted by ;483812
Owners with turbocharged engines, on the other hand, were the biggest losers. Owners of turbocharged V6 engines reported fuel economy 9-percent lower than estimates, and owners of turbocharged four-cylinder engines reported fuel economy that was 4-percent lower than expected.
I don't seem to suffer from this problem

City driving - stay out of boost, duh.

Highway driving - at 65mph is right at the cusp of boost. Therefore, drive 60mph to stay out of boost. Then for P&G I use shorts amounts of boost to get to speed a lot quicker = longer glides = increased average mpg.

3 Seconds of short boost acceleration only lowers my trip mpg by 0.1mpg vs 6 seconds of nonboosting acceleration can lower my trip mpg by 0.5mpg
__________________







See the rest of the Sti project log:
http://ecomodder.com/forum/showthrea...log-26612.html
  Reply With Quote
Old 06-17-2015, 07:43 PM   #36 (permalink)
EcoModding Non-Expert
 
Join Date: Jun 2015
Location: Philadelphia, PA
Posts: 11

SilverOdyssey - '14 Honda Odyssey EX-L V6

SilverCamry - '05 Toyota Camry LE V6
Thanks: 5
Thanked 5 Times in 2 Posts
Smile Interesting!

With manuals down to 8-10% of the U.S. Fleet, only the fleet epa mpg performance of the automatics matter! I never ran epa mpg tests, the auto cos. do it themselves. Only ran octane requirement increase data, and emissions dynamometer test. Of course u.s. Fleet economy matters, if it's not too late!

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com