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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-12-2012, 12:34 PM   #21 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,666

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 641 Times in 508 Posts
Quote:
Originally Posted by Old Mechanic View Post
I get the same mileage at 55 on a deserted US Route 60 as I do at 65-70 on the packed I64
As SentraSE-R said :
Quote:
You can't fight the laws of physics.
There's more drag at 65-70 than at 55 - be it aero, rolling, or mechanical. No way around that.
The question is how the car copes with that.

Old Mech's Fiesta will be in the same gear at either speed - so it can only be a matter of gearing and engine efficiency at the corresponding rpm.
Both are choices that Ford made when bringing it to the market, and since they don't cater for hypermilers, the Fiesta is likely geared to be at its optimum rpm somewhere around those higher, more normal speeds.

Lower rpm is only OK if the engine can still pull it off OK.
It's not always or necessarily better - though you always win a bit by not having to accelerate the extra 10-15 mph.


Quote:
Originally Posted by basjoos View Post
But you can modify them with effective aeromods to flatten out that drop in mpg with increasing speed
Sure you can mod the hell out of a vehicle and reduce its drag, but it's still there - and increasing with speed.

From the speed / MPG numbers you've posted before, I recall that if you drive slower, you also get (even) better MPG.

__________________
GasDwarf's fuel consumption :
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-12-2012, 12:43 PM   #22 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,666

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 641 Times in 508 Posts
Quote:
Originally Posted by skyking View Post
It does go back quite a ways, that beneficial effect. I wonder if a technically savvy guy could make a Cruise control input coupled with a laser rangefinder.
Maybe some indicator lights.
Two dots or thin vertical lines on the windshield could help one to keep the ideal distance - dambuster style - though not automatically.

The width of semis is a known constant.
__________________
GasDwarf's fuel consumption :
  Reply With Quote
Old 06-12-2012, 04:04 PM   #23 (permalink)
Master EcoModder
 
skyking's Avatar
 
Join Date: Apr 2011
Location: Tacoma WA
Posts: 1,344

Woody - '96 Dodge Ram 2500 SLT
Team Cummins
90 day: 23.82 mpg (US)

Avion and Woody - '96 Dodge/Avion Ram 2500/5th wheel combo
90 day: 15.1 mpg (US)

TD eye eye eye - '03 Volkswagen Beetle GLS
90 day: 49.05 mpg (US)

Mule - '07 Dodge Ram 3500 ST
Thanks: 674
Thanked 489 Times in 317 Posts
Put on your drafting glasses!
__________________




2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle

currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears
  Reply With Quote
Old 06-14-2012, 02:08 PM   #24 (permalink)
Rat Racer
 
Fat Charlie's Avatar
 
Join Date: May 2011
Location: Route 16
Posts: 3,948

Al the Third, year four - '13 Honda Fit Base
Team Honda
90 day: 42.9 mpg (US)
Thanks: 1,654
Thanked 1,789 Times in 1,158 Posts
Quote:
Originally Posted by skyking View Post
Put on your drafting glasses!
No, get a drafting hood ornament:


Don't worry about any aero penalty, the semi will handle that.

__________________

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


Thread Tools




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