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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-15-2016, 05:30 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Oct 2010
Location: ireland
Posts: 32
Thanks: 0
Thanked 19 Times in 8 Posts
3 Cylinder Cars - Real World Fuel Consumption

I have always been interested in smaller cars with 3 cylinder engines for their good fuel economy potential. In order to get a feel for which 3 cylinder engined cars actually deliver on their promise, I have searched through the http://www.spritmonitor.de/en database for all the 0.9 to 1.0 lit cars - both na and turbo charged non hybrid - real world average fuel economys as recorded by their owners. Only cars with the ability to carry 4 or more adults have been selected.




The fuel economy average varies from 4.94 l/100 km for the Mitsubishi Mirage/Spacestar to 6.86 l/100 km for the Ford Focus 1.0 Ecoboost, a spread of 39 %. The graph shown below shows quite clearly that for a 3 cylinder car with an engine size between 0.9 and 1.0 litres that car mass significantly influences fuel consumption.



The plot also shows the line of best fit for this data along with the equation. The trend line would appear to indicate that a mass reduction will reduce fuel consumption even for the lightest cars, which are approx 840 kG.

Amongst this data are 2 Skoda cars that share the same 1.0 litre na engine. The Fabia weights in at 980 kG compared to 860 kG for the Citigo. If it is assumed that the average mass for the driver and fuel is 80 kG then the all up mass for the Fabia is 1060 kG and 940 kG for the Citigo. Hence the all up mass for the fabia is some 12.8 % greater than that for the Citigo. However, the Fabia actually burns 17.4 % more fuel than the Citigo, considerably more than what common wisdom would suggest. This almost certainly suggests that a 1.0 litre engine is just too small for a 980 kG car in the real world.

Attached Thumbnails
Click image for larger version

Name:	fuel_consumption_3cyl.jpg
Views:	1094
Size:	30.5 KB
ID:	21059  Click image for larger version

Name:	table_3cyl.jpg
Views:	1006
Size:	41.5 KB
ID:	21066  

Last edited by cr45; 12-16-2016 at 05:02 PM.. Reason: table update
  Reply With Quote
The Following 9 Users Say Thank You to cr45 For This Useful Post:
ctgottapee (01-16-2017), Daox (12-16-2016), Gasoline Fumes (12-17-2016), Joggernot (01-12-2017), JRMichler (12-16-2016), MetroMPG (12-15-2016), niky (12-16-2016), oldtamiyaphile (12-15-2016), Xist (12-24-2016)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 12-15-2016, 05:32 PM   #2 (permalink)
EcoModding Lurker
 
Join Date: Oct 2010
Location: ireland
Posts: 32
Thanks: 0
Thanked 19 Times in 8 Posts
Actual vs claimed Fuel Consumption - 3 cylinder non hybrid cars

I have added the claimed NEDC combined fuel economy for some of the cars from the previous post. The last column shows the difference between the real world average compared to the official claimed fuel consumption as a percentage.

The car with the least difference between actual and claimed is the Mitsubishi Mirage 1.0 with a difference of 17.6%. As the weight of the car increases this difference increases markedly. The 1st and 2nd heaviest cars - Ford Focus and Ford Fiesta - show the greatest difference, 45% for both cars.

Buyers, caveat emptor!


Attached Thumbnails
Click image for larger version

Name:	table_3cyl_diff.jpg
Views:	964
Size:	30.4 KB
ID:	21067  

Last edited by cr45; 12-17-2016 at 03:42 PM.. Reason: content
  Reply With Quote
The Following User Says Thank You to cr45 For This Useful Post:
ctgottapee (01-16-2017)
Old 12-15-2016, 06:27 PM   #3 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 1,915

Winsight - '00 Honda Insight
90 day: 60.6 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 26.67 mpg (US)
Thanks: 67
Thanked 323 Times in 254 Posts
Why is the Honda insight not on there? It's like, the most fuel efficient 3 cylinder on the planet...
__________________

  Reply With Quote
The Following User Says Thank You to Baltothewolf For This Useful Post:
jamesqf (12-15-2016)
Old 12-15-2016, 06:46 PM   #4 (permalink)
EcoModding Lurker
 
Join Date: Oct 2010
Location: ireland
Posts: 32
Thanks: 0
Thanked 19 Times in 8 Posts
Quote:
Originally Posted by Baltothewolf View Post
Why is the Honda insight not on there? It's like, the most fuel efficient 3 cylinder on the planet...
I am only looking at non hybrid.

Also all these vehicles are available to buy as I have avoided cars that are no longer built.
  Reply With Quote
Old 12-15-2016, 07:00 PM   #5 (permalink)
Master EcoModder
 
oldtamiyaphile's Avatar
 
Join Date: May 2009
Location: Western Australia
Posts: 1,033

UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 49.6 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 31.95 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)
Thanks: 217
Thanked 234 Times in 179 Posts
It's a 2 cylinder, but Fiat's Twinair should be on that list.

I'd also like to see a percentage comparison to NEDC in that table.

Anecdotally, I've also found that my Twinair is much more sensitive to weight than you'd expect.

Nice work though
__________________






  Reply With Quote
Old 12-15-2016, 09:49 PM   #6 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 19,092

Blackfly - '98 Geo Metro
Team Metro
90 day: 67.58 mpg (US)

ForkenSwift - '92 Geo Metro EV
Last 3: 95.68 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 38.25 mpg (US)
Thanks: 1,868
Thanked 4,539 Times in 2,271 Posts
Thanks for the info.

Also worth noting (for non-Eurpoeans) that the Mirage / Space Star is available with a 1.0L OR a 1.2L engine in Europe. That's not a typo. I wish the 1.0 were available here, but Mitsu would never live it down.
__________________
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:
Daox (12-16-2016)
Old 12-16-2016, 08:33 AM   #7 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 4,641
Thanks: 0
Thanked 399 Times in 357 Posts
Gearing and the engine tuning obviously also play an important role on that matter much like weight, and a slightly heavier car might eventually rely on a lower differential ratio to keep some agility at the expense of a higher cruising RPM and a lower top speed.
  Reply With Quote
Old 12-16-2016, 09:30 AM   #8 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 1,752

Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 67.49 mpg (US)

Backseats - '04 Honda Civic Hybrid
90 day: 47.91 mpg (US)

Work Van - '16 Chevy Express 2500
90 day: 14.68 mpg (US)
Thanks: 522
Thanked 583 Times in 376 Posts
Nice thing about the Insight is that you can disconnect the hybrid system and it runs fine as a conventional petrol car.

On long trips I can approach 2.3L/100km average on the highway.

Of course, good luck finding one in Europe.
  Reply With Quote
Old 12-16-2016, 09:50 AM   #9 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 1,915

Winsight - '00 Honda Insight
90 day: 60.6 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 26.67 mpg (US)
Thanks: 67
Thanked 323 Times in 254 Posts
Beat me to the punch, Ecky.

I ran gas only in my old beater insight for 15k miles, averaged around 60mpg. That's back when I used to actually drive for MPG, though. Now I get 60mpg with a good battery. Lol. But I do drive 10mph faster than I used to, and am a looooot more aggressive in town.
__________________

  Reply With Quote
Old 12-16-2016, 10:28 AM   #10 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 19,092

Blackfly - '98 Geo Metro
Team Metro
90 day: 67.58 mpg (US)

ForkenSwift - '92 Geo Metro EV
Last 3: 95.68 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 38.25 mpg (US)
Thanks: 1,868
Thanked 4,539 Times in 2,271 Posts
Quote:
Originally Posted by oldtamiyaphile View Post
I'd also like to see a percentage comparison to NEDC in that table.
And sample size.

For comparison, on the Mirage forum, we've got 142 owners reporting 3569 fills over 1 million+ miles / 1.6m km.

When broken down by drivetrain type:

1.2L 5MT avg (69 cars) = 44.8 MPG (US) = 5.3 L/100 KM = 53.7 MPG (UK)
1.2L CVT avg (70 cars) = 41.2 MPG (US) = 5.7 L/100 km = 49.4 MPG (UK.)
1.0L 5MT avg (03 cars) = 45.1 MPG (US) = 5.2 L/100 KM = 54.2 MPG (UK)

Euro Mirages are doing better.

However, many of the Euro Mirages come with automatic engine stop/start, where the majority of cars in our (mostly North American) database don't.

__________________
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:
Frank Lee (12-16-2016)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com