My Pontiac Firefly / Chevrolet Metro / Geo Metro / Suzuki Swift
metrompg.com welcomes fuel efficiency nerds everywhere

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Latest fuel economy stats
for my '98 Firefly 1.0L 5-speed
  best: 2.3 125.1 104.2
 worst: 6.4  44.1  36.8
prev.3: 3.3  82.3  68.6
   all: 3.8  73.4  61.1
L/100km | mpg IMP | mpg US
Jul 28/07: more, graph, calc.
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Automotive magazines:

Latest 10 posts:
1. Experiment: how long should a block heater be plugged in?
2. Everything old is new again: Car and Driver magazine modifies an econobox to improve MPG
3. Project Convertible XFi: alfresco efficiency
4. The floor is yours: MetroMPG opens a fuel efficiency forum
5. Fleet update
6. Q: How do you get 116 mpg (US) in a Metro XFi? A: Pulse and glide.
7. International heart transplant: the Blackfly gets an XFi cam
8. Mini-experiment: the wrath of roof racks
9. Interview with Ron DeLong, inventor of the ScanGauge
10. Meet Rick: motorhead, econohead, Metro XFi owner
11 ... 58. Show all posts




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Links: (added Mar. 14/06)

Discuss amongst yourselves

Good MPG forums: I spend a lot of time at Ecomodder.com and have also been known to lurk around cleanmpg.com.

> Lots more Metro links...
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Suzukiclone info - (newest to oldest):
- Project Convertible XFi: alfresco efficiency
- Meet Rick: motorhead, econohead, Metro XFi owner
- Modified Metro XFi: throwing convention to the wind
- Mark's Metro
- A tale of two Metros
- Gone in sixty seconds
- The holy grail: 82 mpg in a Geo Metro XFi
- Don't take my word for it
- The government lies, and my car is fat
- Review: 1998 Pontiac Firefly - should you get one??



Mods & Tests - (newest to oldest):
- Experiment: how long should a block heater be plugged in?
- International heart transplant: the Blackfly gets an XFi cam
- Mini-experiment: the wrath of roof racks
- Project 'nerd gear': taller tranny transplant nets +5.2% MPG
- Plug-in Blackfly: going alternator optional nets +10% mpg
- Kardboard Kammback: testing a partial boat tail prototype
- Reflections on side mirrors: testing drag vs. MPG
- Speed kills: testing MPH vs. MPG in top gear
- Showdown: testing RPM vs. MPG at a fixed speed
- Mini-experiment: cold start fuel consumption and warm-up time
- Testing a warm air intake (WAI)
- MPG gadgets: Separating the wheat from the chaff
- In praise of the lowly block heater
- Testing grille blocking & wheel skirts: +5.7% improvement
- Testing a 'performance' air filter for MPG - Part 2
- Papier mache aerodynamics: +1.5 MPG?
- Testing a 'performance' air filter for MPG - Part 1
- ScanGauge: electronic crack for the MPG addict
- Firefly efficiency mods



Driving efficiently - (newest to oldest):
- Q: How do you get 116 mpg (US) in a Metro XFi? A: Pulse and glide.
- Coasting experiment: engine off VS. engine idling
- An old driving technique, a record tank - 60.7 mpg (US)
- Driving technique: exploring 'Pulse and Glide'
- Economy driving: fun, illegal, or dangerous?
- Better mileage through video games
- Dutch 'new driving' techniques steer for efficiency
- Online video: economy driving
- 69 mpg: I beat the Canadian rating
- Honda hybrid math quiz
- Honda hybrid quiz answers
- The EPA vs the EX (and the V8): beating the ratings



General - (newest to oldest):
- Everything old is new again: Car and Driver magazine modifies an econobox to improve MPG
- The floor is yours: MetroMPG opens a fuel efficiency forum
- Fleet update
- Interview with Ron DeLong, inventor of the ScanGauge
- 2006 retrospective (there's more where that came from)
- The anti-Metro: how a home-built bicycle trailer lowers my MPG
- Aero mods - 1930's style
- Using Google Earth to verify your odometer accuracy
- MetroMPG miscellany 2
- Visitor comments
- MetroMPG miscellany
- 1000 km by Blackfly: a 52.5 mpg (US) journey
- All I want for Christmas is a plug-in hybrid pusher trailer
- Ad nauseum: three articles updated
- 9 reasons why your winter fuel economy bites!
- Your mileage may vary
- Why metrompg.com?


Send me a note:
darin AT metrompg D-O-T com,
or here



What is MetroMPG.com?
  • First, a source of info for anyone wondering whether to get one of the Suzuki-designed 3-cylinder fuel economy champs: Geo Metro / Chevrolet Metro, Sprint / Pontiac Firefly / Suzuki Swift, Cultus, Forsa.

  • Second, a source of info about DIY efficiency mods, fuel-efficient driving, and fuel economy in general. More ...

Drop me a line. darin AT metrompg D.O.T com, or use this form.


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Posted Thursday, April 17/08 in Mods & Tests

block heater plug OK, so spring may not the best time to be talking about block heaters. Then again, the planet has two hemispheres, after all. So while it may be finally warming up here, somewhere somebody may be plugging in a block heater right now...

Plus, who says block heaters are only for sub-zero use? I use mine three seasons of the year. (And the only reason I don't use it regularly in the summer is because I'm lazy.) Toyota's hybrids (like the Prius) employ their thermos-like tanks to preserve coolant heat for efficiency gains whether January or July.

The question this post addresses is: how long should you plug in a block heater? In other words, what's the shortest time needed for the maximum temperature rise?

Continued inside...



Posted Wednesday, March 12/08 in General

Car and Driver: Project Car - Crisis Fighter Pinto 34 years ago this month, the March 1974 issue of Car and Driver magazine ran an article about DIY modifications to improve fuel economy. The article was a direct response to the 1973/74 oil crisis - which was when people in North America first started seriously talking about improving fuel efficiency to address issues of energy security and high fuel prices.

But the magazine did a lot more than just talk about efficiency. They grabbed the bull by the horns (okay, a Ford Pinto by the bumper) and actually did something about it. Their story, Project Car: Crisis-Fighter Pinto, outlined six simple, mostly aerodynamic modifications which actually saved gas.

After the jump: the six modifications, in detail.

Continued inside...



Posted Thursday, January 3/08 in Suzukiclone info

Metro convertible Last time I wrote about Rick was to profile his modded-for-mileage 1993 Metro XFi hatchback. At the time, he had a lifetime average of 53 mpg (US) since buying the car, with a more or less "normal" driving style.

Almost a year later, a quick look at his gas log shows it's climbed to 60.5 mpg. Nice work! Unfortunately, the secret to his success may lie partly in Mother Nature's aggressive vehicle weight reduction program - the XFi has been rusting out from under him!

But there's a silver lining: Rick just picked up a lightly roasted 1991 Metro convertible for $150 and has launched the ambitious Convertible XFi Project. It's shaping up to be much more than just a powertrain swap.

Continued inside...



Posted Tuesday, December 11/07 in General

Ecomodder.com - the floor is yours! OK, you win!

When I originally set up this site, I made a decision not to include visitor comments with the articles, thinking it would create too much work. Instead, I invited e-mail and responses submitted through the feedback page.

Well, let me tell you something: MetroMPG.com visitors are a chatty bunch! Since day one, I've received & answered literally hundreds of messages ... and lately the rate has been increasing. (So much for saving work.)

So with that in mind, I recently conceded defeat. But in a good way - with the launch of Ecomodder.com, a brand spanking new discussion forum about efficiency modifications, eco-driving techniques and fuel economy in general.

Continued inside...



Posted Thursday, August 16/07 in General

the ForkenSwift By this time last summer I had already run a bunch of fuel economy tests and tinkered plenty with the Blackfly. This year, if it's not obvious already, I've done precious little.

To the fossil fuel-powered car, that is.

I've actually been working on a variety of other vehicles, and in the spirit of the Blackfly, the common theme running through the entire fleet is efficiency. (Most of them even save fuel by replacing some dino juice driving.)

So here's where my tinker time has been going this summer...

Continued inside...



Posted Wednesday, May 30/07 in Driving efficiently

116 mpg XFi Judging by the visitor log, there's a lot of interest in the pulse and glide driving technique. It's one of the most frequent search engine queries that brings visitors here.

In recent years, pulse and glide may have been popularized most by drivers of Toyota's Prius hybrid, partly because it's just so darned easy to do in that car. But contrary to a misconception held by some, this extreme fuel saving method wasn't developed by hybrid drivers, nor is it limited to hybrid cars. In fact, it has been used for decades by participants in extreme fuel economy competitions like the Shell Marathon for experimental vehicles.

A group of just such people - grad students and researchers at the University of California (Davis) - demonstrated the technique (calling it "burn-and-coast") to a writer from Road and Track in 1992. With some coaching, the writer pulled off 116 mpg (US) on a closed course in a bone stock Geo Metro XFi.

Continued inside...



Posted Tuesday, April 24/07 in Mods & Tests

Inside the Blackfly beats the heart of an XFi Is the camshaft a car's heart? Maybe that's the wrong metaphor - it could be the fuel pump. Oil pump? Hmm... Maybe there's no perfect camshaft bio-medical analogy. I came up with the heart comparison because I've had valves on my mind lately.

Valves were also on the minds of the engineers who designed the uber-efficient US-only Metro XFi. Their "economy" camshaft was one of several mechanical improvements that increased the XFi's EPA ratings by 15% (city) and 18% (highway) above its thirstier siblings (the garden variety 3-cylinder Metros).

In pursuit of better fuel economy, a few American TeamSwift.net members have already transplanted XFi cams into their regular Metros. Recently, I followed in their pioneering footsteps, thanks to a friend who performed a cam-ectomy on a junkyard XFi in Utah and sent the prize north across the border on a medevac flight... I mean UPS.

Continued inside...



Posted Saturday, March 10/07 in Mods & Tests

snow board rack I went snowboarding a few weekends back (with 5 other people via diesel van), and couldn't help thinking about aerodynamics & efficiency.

Partly that's because I'm a lousy snowboarder. To keep from coming to a dead stop on the flat sections of the (easy) runs I tend to ride, I sometimes have to crouch way down low (minimizing my frontal area) to maintain to enough momentum to "coast" to where the run drops off again.

But mostly it was because of what I saw in the ski hill parking lot: a sea of roof racks and roof-top carriers. I wondered how many people were aware of the magnitude of the fuel consumption penalty they cause. I wasn't entirely sure myself, so I did a quick comparison and saw some dramatic results first-hand.

Continued inside...



Posted Wednesday, February 21/07 in General

Many the FE nerd's favourite tool: the SG2 The ScanGauge has become such an indispensable tool for fuel efficiency enthusiasts that some people, when shopping for second-hand vehicles, have stopped considering pre-1996 models to ensure that a ScanGauge can be used.

In other words, it has quickly become the fuel saver's favourite gadget.

With this in mind, I set out to learn more about the history of the ScanGauge and its inventor, Ron DeLong. I recently spoke to Ron on a range of topics: his background, how the ScanGauge came to be, and some future plans for the magic little box.

Continued inside...



Posted Wednesday, February 7/07 in Suzukiclone info

Rick's modified 1993 Metro XFi I like learning about other Suzukiclone owners who have been bitten by the efficiency bug. Not only is it a great opportunity to pick up new tips & techniques, but profiling them here has the added benefit of making me seem a little less, um, "extreme" by comparison.

With that in mind, meet Rick. Rick is a genuine motorhead - he's taken his considerable mechanical/technical experience honed on a fleet of traditional high performance cars and applied it to his 1993 Metro XFi to maximize its fuel economy performance for his daily commute. Thus he has also become an econohead.

When it comes to improving efficiency, Rick definitely leans more toward the "mods" side of the "mods + driving technique" formula. The fact that he's been able to average nearly 53 mpg (US) / 4.4 L/100 km / 64 mpg (Imperial) from his XFi, in hilly country, without using any "special" driving techniques is a testament to what he's accomplished mechanically.

Continued inside...



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darin AT metrompg D-O-T com, or here



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