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Old 08-03-2008, 02:58 PM   #1 (permalink)
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Fizz - '06 Skoda Fabia Combi
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Hi from the UK

Just registered - this is the forum I've been looking for for some time!

I have a Citroen Xantia HDi, for the non-Europeans that's a hatchback with already very good aerodynamics, a class-leading (8 years ago) direct injection turbo-diesel with 110hp. I get up to 55mpg (UK) or 5.1 l/100km, measuring over 600 miles, but with fuel at over $2.50 a litre I would like to do better...

It looks to me like adding an undertray at the front and back will be worth doing - the car may well have had one at the front from the factory.

If anyone has fitted a mpg display to this car, I'd be very interested to hear how. It has a OBDII connector which apparently uses an ISO standard.

Simon

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Old 08-03-2008, 07:23 PM   #2 (permalink)
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Scangauge II would be the ideal choice for an OBD II car.
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Old 08-03-2008, 10:11 PM   #3 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 53.78 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
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Hi Simon - welcome to the forum.

The ScanGauge is an excellent tool, or you could build your own MPGuino, if you're the DIY sort.

Is this your car?



Seems like they could have made the aerodynamics even better if they'd not gone for the "faux notchback" look!

I was just having a conversation about Citroens with my neighbour a couple of hours ago. (He's been stopping by regularly to chat, watching the progress on my Kammback construction.) There was one in town today for a bit car show - probably a 70's DS - and he commented on its apparently good aerodynamics.

Darin
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www.MetroMPG.com - fuel efficiency info for Geo Metro owners
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Old 08-03-2008, 10:24 PM   #4 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,642

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

MPGiata - '90 Mazda Miata
90 day: 53.78 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
Thanks: 3,394
Thanked 6,201 Times in 3,212 Posts
$54 worth it? Probably not. But that's what coroplast election signs are for.
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Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



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
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Old 08-03-2008, 10:40 PM   #5 (permalink)
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Quote:
Originally Posted by BlackDeuceCoupe View Post
Bwahahaha!

But... I would have to wait until after the elections, right?
Depends on whether you like the candidate or not
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Old 08-04-2008, 06:33 AM   #6 (permalink)
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Join Date: Aug 2008
Location: UK
Posts: 104

Fizz - '06 Skoda Fabia Combi
TEAM VW AUDI Group
90 day: 56.62 mpg (US)
Thanks: 3
Thanked 9 Times in 7 Posts
Yes, that's the car - or at least the Mk1 version. Mine has a slightly different grille, A/C, more airbags - and more weight. They all feature hydropneumatic suspension - amazingly effective but it does mean engine-off coasting is not possible. Don't really want to lose suspension, brakes and steering...

What would be better than the faux notchback? Simply filling in the triangle between the top of the roof and the boot lip?

Just discovered the MPGuino - looks good. I know some have had no luck using ELM devices. At least I get something to play with if it won't work with my car...

Simon
Quote:
Originally Posted by MetroMPG View Post
Hi Simon - welcome to the forum.

The ScanGauge is an excellent tool, or you could build your own MPGuino, if you're the DIY sort.

Is this your car?



Seems like they could have made the aerodynamics even better if they'd not gone for the "faux notchback" look!

I was just having a conversation about Citroens with my neighbour a couple of hours ago. (He's been stopping by regularly to chat, watching the progress on my Kammback construction.) There was one in town today for a bit car show - probably a 70's DS - and he commented on its apparently good aerodynamics.

Darin
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Old 08-04-2008, 10:05 AM   #7 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,642

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

MPGiata - '90 Mazda Miata
90 day: 53.78 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 61.98 mpg (US)

Fancy Metro - '14 Mitsubishi Mirage top spec
90 day: 58.72 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 66.29 mpg (US)
Thanks: 3,394
Thanked 6,201 Times in 3,212 Posts
Quote:
Originally Posted by ecoxantia View Post
What would be better than the faux notchback? Simply filling in the triangle between the top of the roof and the boot lip?
Something like that, yes. There's an ideal rear angle/shape which simply drawing a line between those two points might not satisfy exactly, but a properly tapered roof/hatch transition at the rear would lead to a smaller trailing wake and would be better than the current shape. Air flow separates at the trailing edge of the roof in this notchback design with no chance of reattachment on the short "faux" deck lid.

__________________
Latest mods: 3-cylinder Mitsubishi Mirage. EcoMods now in progress...
Ecodriving test:
Manual vs. automatic transmission MPG showdown



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
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