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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Latest 10 posts:
1. 60+ vehicle modifications for better MPG
2. Metro mania: forget stocks, put your money in old Geos!
3. 100+ Hypermiling / ecodriving tips for better gas mileage
4. Experiment: how long should a block heater be plugged in?
5. Everything old is new again: Car and Driver magazine modifies an econobox to improve MPG
6. Project Convertible XFi: alfresco efficiency
7. The floor is yours: MetroMPG opens a fuel efficiency forum
8. Fleet update
9. Q: How do you get 116 mpg (US) in a Metro XFi? A: Pulse and glide.
10. International heart transplant: the Blackfly gets an XFi cam
11 ... 61. Show all posts

          Vehicle Transport

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Links: (added Mar. 14/06)

Discuss amongst yourselves

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

> Lots more Metro links...
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Send me a note:
darin AT metrompg D-O-T com,
or here

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

MPG Details: 1998 Pontiac Firefly

Updated: Jul 28, 2007

fuel gauge


  • Compare to official government ratings...
    Canada  city:  5.4  52.0  43.3
    Canada   hwy:  4.3  66.0  55.0 
    Can Combined:  4.9  57.6  48.0  (source)
    US EPA  city:  5.3  52.8  44.0  
    US EPA   hwy:  4.8  58.8  49.0  
    US  combined:  5.2  55.1  46.0  (source)

    (Why such a large discrepancy between the two countries' highway figures? Hmmm.)

  • View graphs of mileage details

    click to view graphs of mileage details

    View graphs and complete tank-by-tank and cumulative mileage for both Firefly #1 (retired) and #2 (Blackfly).

  • Conversions used
    1 L = 3.7854118 US gallons = 4.54609188 imperial gallons
    1 mile = 1.609344 kms
  • km/L
    MPG (Imp)
    MPG (US)
    (open calculator in new window)

  • Best and worst stats are for single fill-ups on either Firefly #1 or #2 and have to be taken with a grain of salt, since I don't typically drive to "E" before refilling (e.g. if I drive a 300 km highway trip, I might fill up at the end to get a "highway only" reading). The smaller the refill, the greater the margin of error.

  • Best was for Firefly #2 - a 431 km distance, a mix of city and rural highway driving. This was an experiment in pulse and glide (though all the trips were legitimate), just to see if I could break the 100 mpg (US) barrier.

  • Worst was for Firefly #1 - just 100 km of city driving.

  • Previous 3 is for Firefly #2 - cumulative figures from the last 3 fill-ups. This gives a more accurate snapshot of how things are going recently. I typically fill up once a month.

  • All: a total of all fuel consumption for Firefly #2 since I got the car. To date, 11341 km and 436.5 L.

  • When I fill up, I aim for consistency by always filling to the same point - i.e. where I can see fuel at the top of the filler neck. This is usually several "clicks" past where the pump wants to stop at first.

  • Retired stat: City - cumulative urban fuel consumption for fill-ups that were exclusively sub/urban driving. To date, 1567 km and 86.0 L. (I don't get as many fill-ups that meet these criteria, because I don't do much exclusively city driving between highway trips). Retired this stat after May 3/06 fill-up.

  • Retired stat: Hwy - a calculation of my cumulative highway fuel consumption where the trip length (before refueling) exceeds 200 km. To date, 4216 km and 196.1 L. Retired this stat after May 3/06 fill-up.

  • Retired stat: Mixed - cumulative fuel consumption where driving is a mix of both sub/urban and hwy. To date, 4771 km and 243.0 L. Retired this stat after May 3/06 fill-up.

  • Of course, this all assumes that my odometer is accurate (I should really check that - [EDIT: I have verified my odometer), and that the gas pumps report accurate volumes.

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