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Old 06-05-2009, 12:53 PM   #1 (permalink)
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Cobalt XFE - '08 Chevrolet Cobalt XFE
Team Chevy
90 day: 41.1 mpg (US)

'05 Malibu V6 Tow Vehicle/Track Car - '05 Chevrolet Malibu LS V6
90 day: 23.12 mpg (US)

'08 XFE average for 2013 - '08 Chevrolet Cobalt XFE
90 day: 41.1 mpg (US)
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Talking First 50+ mpg tank for my '08 Cobalt XFE

I finaly did it and broke the 50 mpg barrier (51 mpg to be precise).

All driving was done on my 75 mile round trips to and from work and fillups were done at the same gas pump.

Total distance from the tank was 586.8+ miles using 11.504 gallons.

My in car mpg reader actualy said I did 51.5 but it's usualy off by +/- 1mpg.

The ends I had to go to to get it were a bit extreme (45 in a 55 mph limit) so it wouldn't be a regular accurance but it's getting me more interested in doing some aero mods to hopefully help get my tanks up to the mid to upper 40's on average.

Wife is going to Disney this weekend so maybe I'll have the chance to work on some aero mods.

Other then running the stock tires at sidewall max (44 psi) +/- 1 psi the car is a completly stock 2008 Chevy Cobalt XFE with 22,000 miles on it.

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Old 06-05-2009, 02:29 PM   #2 (permalink)
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Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
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Fantastic! Nicely done.

I am ashamed to say I've yet to break the 50 mpg mark for a full tank fillup myself.....
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Old 06-05-2009, 05:40 PM   #3 (permalink)
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1999 Saturn SW2 - '99 Saturn SW2 Wagon
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90 day: 40.49 mpg (US)
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Fr3AkAzOiD -

It makes me happy to see your Cobalt strut it's stuff.

CarloSW2
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Old 06-05-2009, 06:14 PM   #4 (permalink)
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Join Date: Jul 2008
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Cobalt XFE - '08 Chevrolet Cobalt XFE
Team Chevy
90 day: 41.1 mpg (US)

'05 Malibu V6 Tow Vehicle/Track Car - '05 Chevrolet Malibu LS V6
90 day: 23.12 mpg (US)

'08 XFE average for 2013 - '08 Chevrolet Cobalt XFE
90 day: 41.1 mpg (US)
Thanks: 41
Thanked 25 Times in 20 Posts
Thanks, not bad for a car EPA rated at 25/29/36.
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Old 06-06-2009, 09:22 AM   #5 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,078
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You should do a garage entry/fuel log.

That's the best I think I've seen from a Cobalt XFE. Nice work!
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Old 06-10-2009, 03:16 PM   #6 (permalink)
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Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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I'm allowed to be jealous right? And no one will think less of me?

Great job man! I can't touch that, and I try pretty hard. I've been able to pull 50 MPG trips, but not 50 MPG tanks. See my garage for my results.

I wonder how much the LRR tires help?

The gear ratio change isn't THAT intense, and i have the distinct feeling that BSFC is best close to 2500 RPM...
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Old 06-10-2009, 03:45 PM   #7 (permalink)
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Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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.... Ok, this is bugging me to no end..

No one is allowed to beat me at my own game! :P


Race you to 60 MPG? If you don't mind a little friendly competition?
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Old 06-11-2009, 11:18 PM   #8 (permalink)
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Cobalt XFE - '08 Chevrolet Cobalt XFE
Team Chevy
90 day: 41.1 mpg (US)

'05 Malibu V6 Tow Vehicle/Track Car - '05 Chevrolet Malibu LS V6
90 day: 23.12 mpg (US)

'08 XFE average for 2013 - '08 Chevrolet Cobalt XFE
90 day: 41.1 mpg (US)
Thanks: 41
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I doubt a 60 mpg tank is possible.

I'll race you to a 55 mpg tank though, 500 miles minimum.
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Old 06-15-2009, 04:40 AM   #9 (permalink)
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Makai - '01 Toyota Echo 4D Auto
90 day: 34.45 mpg (US)

New Galaxy - '07 Toyota Prius
90 day: 42.15 mpg (US)
Thanks: 25
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whats your technique?

eoc, p&g?



and is it still considered P&G if you dont shut off?
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Old 06-15-2009, 09:02 AM   #10 (permalink)
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527

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

MPGiata - '90 Mazda Miata
90 day: 54.46 mpg (US)

Even Fancier Metro - '14 Mitsubishi Mirage top spec
90 day: 70.75 mpg (US)

Appliance car Mirage - '14 Mitsubishi Mirage ES (base)
90 day: 62.14 mpg (US)
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
Sounds like he's mainly just watching his speed:

Quote:
The ends I had to go to to get it were a bit extreme (45 in a 55 mph limit
The XFE is geared for good fuel economy on the open road at medium speeds.

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Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage.
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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