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Fooled by the SGII!
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10-22-2009, 02:17 AM
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Senior Member
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Join Date: Sep 2008
Posts: 498
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Fooled by the SGII!
According to my SGII I only had slightly less than a gallon left in my tank. That'd be enough for 1.5 commute trips. So I decide to fillup. It turns out I still had 1.8 gallons left, just enough to last until the weekend. It told me I was getting 38.4 mpg but I really ended up with 42 mpg. I suppose it's better to overestimate rather than understand consumption like that one time I was on the freeway and ran out of gas because the SGII told me I had enough...
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10-22-2009, 03:15 AM
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Member
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Join Date: May 2009
Vehicles: 2005 Suzuki Swift
Location: Perth, Western Australia
Posts: 49
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Re: Fooled by the SGII!
Quote:
Originally Posted by jhu
I was on the freeway and ran out of gas because the SGII told me I had enough...
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Sorry but i had a nice little laugh out of that 
Is your fuel gauge sitting on top of the E if you run it that low?
And isn't it supposed to be bad for the car to run the fuel tank to empty?
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10-22-2009, 09:30 AM
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Senior Member
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Join Date: Oct 2008
Posts: 211
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Re: Fooled by the SGII!
Jhu,
SGII is never 100% accurate. Even if you install an offset that makes it accurate, that offset is only accurate *IF* your commute or weather doesn't change.
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10-25-2009, 06:16 PM
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Senior Member
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Join Date: Sep 2008
Vehicles: 1999 Buick LeSabre
Location: Columbia, SC
Posts: 502
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Re: Fooled by the SGII!
Quote:
Originally Posted by Tomjones76
SGII is never 100% accurate. Even if you install an offset that makes it accurate, that offset is only accurate *IF* your commute or weather doesn't change.
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That's the truth. I've had it be up to 2 mpg underestimating before. That trip was my personal best tank distance-wise.
This past weekend it was underestimating 0.5 mpg coming back from Florida.
Day-to-day it's spot on.
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1999 Buick LeSabre
"Look at the rolling couch!"
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10-26-2009, 02:53 AM
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Pizza driver: 55,000+ deliveries
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Join Date: Aug 2008
Vehicles: 92 Geo Metro convertible 1.L, 3 cyl, 5 speed and a FSP
Location: Corncob, NC
Posts: 1,390
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Re: Fooled by the SGII!
I can't use a scangauge for my 92 Metro but this somewhat related to your thread...I believe my odometer is off by 1/10th of a mile.
From mile marker to mile marker my odometer reads 9/10ths and on long trips, distance traveled on the odometer is always less than mapquest's distances, even simple straight line comparisons like gas station A to gas station B on the same freeway.
When I see a sign that says 20 miles to Exit 8 my odometer is never right. I noticed this more on my recent NC to FL trip as I had never taken the convertible on any long trips (+150 miles) before May of this year and only that one time to Kacey's Honda dealership in Columbia SC.
The upside is if I confirm this discrepancy with a GPS I'll be able to adjust my mileage log by a positive 10%!!! But until I can verify I'll keep on logging as the odometer reads. It's like knowing your gonna get a big boost in mileage one day.
 - Dale
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Best tank 50.18mpg w/9.169g=460.1 miles; May 28-31, 2009
Last edited by drimportracing : 10-26-2009 at 03:01 AM.
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10-28-2009, 02:46 PM
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Senior Member
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Join Date: Jun 2008
Vehicles: RAV4
Location: Fairfax, VA
Posts: 491
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Re: Fooled by the SGII!
I wish the ECU outputed Gallons per hour!
How hard is it for the computer to count each spray and the diration?
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Average MPG since starting the Log:
Click Me for Log ^^^
Best tank yet:
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11-07-2009, 10:06 AM
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Senior Member
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Join Date: Oct 2008
Vehicles: 2006 Honda Civic Hybrid
Location: Coquitlam, BC (Greater Vancouver Area)
Posts: 424
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Re: Fooled by the SGII!
I'm off-topic, but anyway: my preference is to tank up any time we're below the 1/2 full mark and happen to be going by our station brand. This means slightly more frequent fillup chores, a slightly higher median gas weight being carried, that's about it for the negatives.
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11-07-2009, 11:32 AM
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Senior Member
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Join Date: Sep 2008
Posts: 498
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Re: Fooled by the SGII!
So now that my SGII is over reporting fuel consumption, I just found out I could have safely gotten 600+ miles on this tank. Oh well. It's better than running out of fuel. Although I suppose I could stash a spare gallon in the trunk...
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11-08-2009, 05:43 PM
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Junior Member
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Join Date: Sep 2009
Vehicles: 1998 Chevrolet Lumina (base)
Location: Fox Valley, WI, US
Posts: 5
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Re: Fooled by the SGII!
Are you adjusting the fuel amount in the FILLUP menu each time? That seems like a lot of error if you have been correcting.
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11-09-2009, 09:16 PM
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Senior Member
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Join Date: Oct 2008
Vehicles: 1994 Toyota Corolla M5
Location: Safety Harbor, FL
Posts: 175
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Re: Fooled by the SGII!
Quote:
Originally Posted by drimportracing
I can't use a scangauge for my 92 Metro but this somewhat related to your thread...I believe my odometer is off by 1/10th of a mile.
From mile marker to mile marker my odometer reads 9/10ths and on long trips, distance traveled on the odometer is always less than mapquest's distances, even simple straight line comparisons like gas station A to gas station B on the same freeway.
When I see a sign that says 20 miles to Exit 8 my odometer is never right. I noticed this more on my recent NC to FL trip as I had never taken the convertible on any long trips (+150 miles) before May of this year and only that one time to Kacey's Honda dealership in Columbia SC.
The upside is if I confirm this discrepancy with a GPS I'll be able to adjust my mileage log by a positive 10%!!! But until I can verify I'll keep on logging as the odometer reads. It's like knowing your gonna get a big boost in mileage one day.
- Dale |
I think I have the same problem, and I can't believe I'm getting beat so bad in the FE runs when I P&G like crazy!
I won't change it until I verify it's wrong, but I have a hunch that one day I need to change my FE for the better.
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All praise the Flying Spaghetti Monster!
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