Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 11-02-2009, 11:58 AM   #1 (permalink)
Batman Junior
MetroMPG's Avatar
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,459

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

MPGiata - '90 Mazda Miata
90 day: 55.97 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car - '14 Mitsubishi Mirage ES (base)
90 day: 67.41 mpg (US)
Thanks: 3,997
Thanked 6,889 Times in 3,574 Posts
UK version of VW Polo gets lower MPG due to different exhaust routing

Found this interesting tidbit:

Right-hand-drive Volkswagen Polo diesels will have slightly worse fuel economy and higher CO2 emissions than the left-hand-drive versions sold in mainland Europe.

This is because the oxidation catalyst and diesel particulate filter in the exhaust system have been moved... [to permit the switch to right-hand drive].
The figures given for the 1.2 L diesel are:
  • 90g/km of CO2 for right-hand-drive in UK
  • 87g/km of CO2 for left-hand drive elsewhere
(CO2 is proportional to fuel consumption.)

I wonder just how convoluted the UK exhaust routing had to get to have a measurable effect on fuel economy?

Source: http://www.whatcar.com/car-news/vw-p...iciency/244512

Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
Ecodriving test: Manual vs. automatic transmission MPG showdown

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
Alt Today
Popular topics

Other popular topics in this forum...

Old 11-02-2009, 12:14 PM   #2 (permalink)
Daox's Avatar
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,184

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
90 day: 56.69 mpg (US)
Thanks: 2,485
Thanked 2,553 Times in 1,537 Posts
Pictures would have been so nice.
Current project: A better alternator delete
  Reply With Quote
Old 11-02-2009, 12:38 PM   #3 (permalink)
Join Date: Feb 2008
Location: california
Posts: 1,329
Thanks: 24
Thanked 161 Times in 107 Posts
Diesels are very susceptible to changes in back pressure.
  Reply With Quote
Old 11-02-2009, 03:53 PM   #4 (permalink)
...beats walking...
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
...didn't know that diesels could get "constipated"

...I've learned something new today.
  Reply With Quote
Old 11-02-2009, 04:32 PM   #5 (permalink)
Frank Lee's Avatar
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,553 Times in 2,217 Posts
OK this is my WAG but I suspect "backpressure" is not really a factor; they are talking emissions which include cold start and thus the distance from cat and filter to engine is critical for their heating-up phase.

I suppose if it was more involved that merely shuffling the cat and filter around i.e. if they made them different and less free-flowing that could explain it too.

It would be good to know if these measurements and differences are due to cold start or steady state.


Last edited by Frank Lee; 11-02-2009 at 04:37 PM..
  Reply With Quote
Reply  Post New Thread

Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
New 2010 VW Polo: lighter, safer, higher mpg (71), better looking... Coming here? MetroMPG General Efficiency Discussion 38 05-20-2020 02:23 AM
BBC reporter drives the new VW Polo Bluemotion 566 miles, gets 50 mpg (US) MetroMPG General Efficiency Discussion 1 04-08-2011 10:58 AM
Biodiesel UK test VW Golf - MPG results pending sallen Fossil Fuel Free 5 02-20-2010 11:09 AM
MetroMPG.com mailbag: VW Polo transmission swap not very successful MetroMPG EcoModding Central 6 07-04-2009 12:39 AM
VW Golf with exhaust thermoelectric power: +5% MPG MetroMPG EcoModding Central 25 03-04-2009 03:17 PM

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com