My Pontiac Firefly / Chevrolet Metro / Geo Metro / Suzuki Swift 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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Best non-hybrid MPG: Mitsubishi Mirage
Highest MPG for a new car: Mitsubishi Mirage?
Mitsubishi's 1.2L, 3-cylinder Mirage is the first new non-hybrid car that can match an old Metro's mileage. The company says 44 mpg (US) highway, 37 city. (Some drivers are already beating that in various economy driving contests.) How? An efficient engine, very light weight and aerodynamic design.

Cheapest to own? 2015 Nissan Micra Forum
2015 Nissan Micra Forum
The Micra's fuel economy isn't its most notable feature -- the $10,000 price is. That makes it one of the cheapest cars to own. And its 109hp, 1.6L engine and good power-to-weight ratio means it's fun to drive too.

Latest 10 posts:
1. Recipe for getting 99.7 mpg from a Geo Metro
2. - famous aerodynamic Honda Civic gets a web site
3. Snapshot: effect of tire pressure on rolling resistance
4. 65+ vehicle modifications for better MPG
5. Metro mania: forget stocks, put your money in old Geos!
6. 100+ Hypermiling / ecodriving tips for better gas mileage
7. Experiment: how long should a block heater be plugged in?
8. Everything old is new again: Car and Driver magazine modifies an econobox to improve MPG
9. Project Convertible XFi: alfresco efficiency
10. The floor is yours: MetroMPG opens a fuel efficiency forum
11 ... 64. Show all posts

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

Chevrolet Aveo forum - discussion of the Chevrolet Aveo and its siblings (Pontiac Wave, Pontiac G3, Suzuki Swift+, Daewoo Kalos).

> Lots more Metro links...
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Suzukiclone info - (newest to oldest):
- Metro mania: forget stocks, put your money in old Geos!
- 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):
- Recipe for getting 99.7 mpg from a Geo Metro
- Snapshot: effect of tire pressure on rolling resistance
- 65+ vehicle modifications for better MPG
- 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):
- 100+ Hypermiling / ecodriving tips for better gas mileage
- 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):
- - famous aerodynamic Honda Civic gets a web site
- 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

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

What is
  • 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.

MetroMPG has opened a fuel economy forum
Read about the project here, or go straight to
ScanGauge fuel economy computer Save fuel with a ScanGauge II fuel economy computer.
I personally recommend this tool. I've owned both versions (I and II) and can't say enough good things about it. If you're serious about saving fuel, get one.

For more information and to order, visit EcoModder.

Posted Wednesday, May 13/09 in Mods & Tests

Green Grand Prix logo At the start of this month, alt-fuel and efficiency enthusiasts gathered in Watkins Glen, New York for the 5th annual Green Grand Prix expo and fuel economy rally. I entered my modified 1998 Pontiac Firefly (Geo Metro) in the rally, and managed to score the top result of 99.7 mpg (US) (2.4 L/100 km / 119.7 mpg imperial) in a field of 25 vehicles - including hybrids, diesels ... and even a pair of Vespa scooters! How does one squeeze 99 mpg from an old Metro? Here's the recipe - mods & driving techniques - used for the event...

Continued inside...

Posted Tuesday, February 10/09 in General

Aerocivic teaser This winter, EcoModder member Mike Turner was looking for a way to give the motoring public more information about his 1992 Honda Civic CX, which he has extensively modified to improve aerodynamics and reduce fuel consumption. Initially, he posted the car's "stats" directly on its flank: coefficient of drag (0.17 est.), fuel economy (70 mpg US average), higher top speed (140 mph estimated), etc.

Well, you've probably heard of the term "unintended consequences" ... and if Mike hadn't before, he definitely knows it now! The writing on the car resulted in enough additional rubbernecking to cause traffic problems, making lane changes difficult for Mike, and causing cars in the passing lane to bunch up behind the gawkers/readers.

If ever there was a reason to stick a web address on a vehicle, this was it. So I offered to make Mike a web site so he could replace the stats on the side of the car with "". Now motorists who see the car have the opportunity to learn the details from the safety of their computer chairs, rather than while barrelling down the highway beside it.

Continued inside...

Posted Tuesday, January 20/09 in Mods & Tests

tire pressure How important is tire pressure to rolling resistance and fuel economy? Apparently important enough that it became an issue in the 2008 US presidential election: one party mocked the other for suggesting that Americans could displace a significant amount of oil demand by simply maintaining their tires at the correct pressure.

Of course anyone with a shred of interest in efficiency already knows that tire pressure is one of the basic first steps.

But it's one thing to read stats, and another to see the relationship demonstrated in real life. So last summer I set out to do a snapshot test of how far (or not) my car rolls down the same course at varying tire pressure levels.

Continued inside...

Posted Monday, October 6/08 in Mods & Tests

wrench diagram One of the more popular pages on this site, according to the traffic logs, is the list of modifications I've done to my car to increase its efficiency.

Apparently people are hungry for quality information - real ways to save fuel that don't involve dubious gadgets pitched in infomercials, additives promoted with no scientific basis, or hare-brained schemes that occasionally gain traction on the Internet.

With that in mind, the members over at EcoModder have recently compiled a comprehensive list of 65+ gas saving modifications that are well understood & documented with examples.

Continued inside...

Posted Sunday, August 24/08 in Suzukiclone info

for sale sign (...Updated Sept 26/08...) My very first car was a behemoth: a 1964 Pontiac Catalina with a massively thirsty 389 cubic inch engine. When I bought it to restore, there was a little notebook in the glove box the previous owner had used to track his fuel economy. I remember the row of exclamation marks beside his best ever fill of 19 mpg (US). Unfortunately, 14 or 15 mpg was the norm.

The big Cat is long gone, and I've come full circle back to Pontiac via the Firefly. But the badge on the hood is about the only thing the Flea has in common with the monster Catalina. Its little 3 cylinder engine doesn't have even 1/6th the displacement of the 389 V8!

Apparently I'm not the only one who has downsized into a thrifty car lately. With $4 gasoline in the US this summer, people were abandoning their guzzlers... and apparently their common sense by paying startlingly high prices for some 1 litre action.

Continued inside...

Posted Sunday, May 18/08 in Driving efficiently

hypermiling tips There's no question that the biggest potential fuel saving modification is adjusting the nut behind the wheel.

At the end of 2006 I posted a retrospective that showed this. I compared the impact of all the mods I'd done to the car against changes in driving style. The mods were collectively worth about a 28% improvement in MPG. And the driving techniques? How about a whopping 38% boost.

The benefit of a modded vehicle is that it will get better efficiency regardless of the driver. The benefits of developing efficient driving techniques is they're free and portable - you can bring them to any vehicle you drive.

To help spread the knowledge, several EcoModder members (including your humble nenpi maniac) recently collaborated on a big list of 100+ hypermiling / ecodriving tips & techniques.

Continued inside...

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 - 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: 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, a brand spanking new discussion forum about efficiency modifications, eco-driving techniques and fuel economy in general.

Continued inside...

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EcoModder fuel economy forum Note: MetroMPG has opened a fuel economy forum
Read about the project here, or go straight to

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