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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-29-2010, 01:48 PM   #11 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by VegasDude View Post
My engine produces a healthy amount of torque and so my goal is always shifting around 1-1.2k rpm.
What does it drop down to after shifting ?
Must be way down low !

Definitely not something you can do with every car.

Quote:
I'm into 5th by 25 mph
OK, so I had heard about short-shifting, but never about anyone shifting that early

That's about idling speed for me ... in 4th (of 5) gears !
(FE around idling speed is horrible for me)


Surely our driving environments are vastly different, but you're getting about the same mpg from a petrol engine with more than twice the displacement of my lowly diesel !

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-30-2010, 10:26 AM   #12 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,316

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: 606
Thanked 423 Times in 277 Posts
VegasDude has a V6.

I aim for each shift to land in the next gear at about 1300 rpm. Give or take depending on the terrain - higher rpm for uphill.

Yes, it is slow acceleration. That's good for mileage. Anything in a hurry will use more gas.

I have recently been tweaking my shifts - I was keeping the rpm TOO low. By that, I mean I'm now running 1300-2000 rpm instead of 1100-1800. That's about the upper limit, though. Any higher, and the glide cannot make up for the fuel used in the pulse. I watch the trip average mpg like a hawk, and focus on making it go up with each cycle.
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
The Following User Says Thank You to PaleMelanesian For This Useful Post:
dleefoto (09-29-2010)
Old 07-30-2010, 11:54 AM   #13 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,316

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: 606
Thanked 423 Times in 277 Posts
low rpm better:
Showdown: testing RPM vs. MPG at a fixed speed - MetroMPG.com
__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
The Following User Says Thank You to PaleMelanesian For This Useful Post:
euromodder (08-01-2010)
Old 07-30-2010, 08:44 PM   #14 (permalink)
See ya at the next light!
 
Join Date: Apr 2010
Location: Las Vegas, NV
Posts: 67

Slowest. Altima. Ever. - '05 Nissan Altima SE
90 day: 45.91 mpg (US)
Thanks: 2
Thanked 5 Times in 5 Posts
The truth is even tho I take my foot completely off the gas, the revs usually go up close to 2k when I push in the clutch to shift. The only way to keep this from happening is to take my foot off the gas for ~3 seconds before shifting, not usually practical.

I often overshoot going from 1st to 3rd since 1200 rpms comes pretty fast. An ideal situation would be timing the lights well enough to rarely need 1st, since it's geared so low it's almost not nessesary.

Yes, even 18 mph into 5th is no problem, but at that speed I'm only idling around the neighborhood. Things change with hills, but having a higher displacement engine helps keep the revs low around town.
__________________
  Reply With Quote
The Following User Says Thank You to VegasDude For This Useful Post:
euromodder (08-01-2010)
Old 08-01-2010, 05:31 AM   #15 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by VegasDude View Post
The truth is even tho I take my foot completely off the gas, the revs usually go up close to 2k when I push in the clutch to shift. The only way to keep this from happening is to take my foot off the gas for ~3 seconds before shifting, not usually practical.
Strange.
Tho I've always driven manuals, I've never experienced anything like that.

Unless I get off the throttle a tad too late, the revs start dropping instantly - I even keep a bit of throttle on when shifting up to counter that drop.

But then, I've never really explored the low-revving territories before

Quote:
Yes, even 18 mph into 5th is no problem
I'm amazed !

Quote:
but at that speed I'm only idling around the neighborhood.
Your comment and PaleMelanesian's link have triggered me to re-try the near-idling trick again in a 20mph (actually 18.6 mph here ) zone, but in 3rd and on cruise control this time.

Amazingly, I got 58 mpg going 20mph in 3rd around idling rpm !
Thanks guys !
I used to be happy with anything slightly better than 32 mpg in 2nd using CC
Controlling the throttle myself, anything better than 25 mpg used to be fine - hence 20 mph zones were killing my overal FE.


Now, if this works at 20mph in 3rd, there's no reason why it won't work @ 30mph in 4th (rather than 3rd), maybe even @ 45mph in 5th (instead of 4th).

More experimentation coming up
  Reply With Quote
Old 08-01-2010, 07:11 PM   #16 (permalink)
See ya at the next light!
 
Join Date: Apr 2010
Location: Las Vegas, NV
Posts: 67

Slowest. Altima. Ever. - '05 Nissan Altima SE
90 day: 45.91 mpg (US)
Thanks: 2
Thanked 5 Times in 5 Posts
Yeah the revs only go up when shifting when you shift at low revs. If you shift around 2.5k the revs only go down when you push in the clutch.
__________________
  Reply With Quote
Old 08-01-2010, 07:26 PM   #17 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by euromodder View Post
Now, if this works at 20mph in 3rd, there's no reason why it won't work @ 30mph in 4th (rather than 3rd), maybe even @ 45mph in 5th (instead of 4th).
20mph in 3rd, and 30mph in 4th work on level roads or downhill, but FE plummets on the slightest incline.

45mph in 5th doesn't work at all, not even on slightly downhill roads - the engine is struggling and simply can't take this load efficiently.
  Reply With Quote
Old 08-31-2010, 12:02 AM   #18 (permalink)
Aero Deshi
 
ChazInMT's Avatar
 
Join Date: Jan 2010
Location: Vero Beach, FL
Posts: 1,065

MagMetalCivic - '04 Honda Civic Sedan EX
Last 3: 34.25 mpg (US)
Thanks: 430
Thanked 666 Times in 357 Posts
How Much Does AC affect Mileage?

So I drove to Ohio from Montana & back and averaged 37 MPG in the Civic that's rated 34 MPG hwy. I stayed at around 70 Max, 65 when the law. My tanks ranged from 41.2 to 34.6 MPG. Question...How much does the AC kill mileage?? I'm guessing a 8-10% hit (3-4 mpg to me), what is the general rule of thumb on this? I had to have it on half the time cause it was freaken hot out. My fuel log showed this difference.
  Reply With Quote
Old 08-31-2010, 12:20 AM   #19 (permalink)
See ya at the next light!
 
Join Date: Apr 2010
Location: Las Vegas, NV
Posts: 67

Slowest. Altima. Ever. - '05 Nissan Altima SE
90 day: 45.91 mpg (US)
Thanks: 2
Thanked 5 Times in 5 Posts
It really depends on the car. In a big SUV, it's already burining a lot of gas just to move down the road, so as a percentage of the fuel burned, the A/C isn't adding much. I believe a smaller and more aerodynamic car will suffer more. It also depends on the temperature outside and how cool you want it inside. The A/C compressor usually isn't running 100% of the time, but enough to keep the evaporator cold. The less cold air you need, the less it runs. Although, in some vehicles, the compressor might run 100% of the time.

I drove a Civic for a few years and I remember using the A/C generally dropped my mileage by 5-6 MPG, that was well before I cared about improving my mileage.
__________________
  Reply With Quote
Old 08-31-2010, 06:47 PM   #20 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Quote:
Originally Posted by ChazInMT View Post
Question...How much does the AC kill mileage?? I'm guessing a 8-10% hit (3-4 mpg to me), what is the general rule of thumb on this?
That won't be far off the mark.
When using CC, I'm instantly using 10% more fuel when switching the A/C on.
When left on, the FC drops down again to slightly above previous amount - until the time when the AC comes on again (like when setting a colder temp).

When I switch it off when its running full blast (think defog) it's an instant 10% increase in FE.

The weird thing is I only saw this happening after I had CC installed.
Before that, I didn't believe it could make such a big impact as I wasn't seeing any, but apparently it does.

With the ScanGauge, it also shows up in the engine load.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
1994 Honda Civic D15 3-STAGE VTEC TURBO 55+ MPG FullRacePhil For Sale 30 03-03-2015 08:05 AM
Pulse & Glide on Hills mush3gan Hypermiling / EcoDriver's Ed 7 07-13-2013 02:20 PM
Pulse and Glide on the Honda CRX SVOboy Hypermiling / EcoDriver's Ed 4 05-09-2009 01:19 AM
Old School hypermiler PULSE AND GLIDE Dragonova Hypermiling / EcoDriver's Ed 13 07-08-2008 08:26 PM
Re-attempting Pulse and Glide (with an automatic) Lazarus Hypermiling / EcoDriver's Ed 6 12-11-2007 09:06 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com