How Accurate is Your Mpg? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
All about MPG All about maximizing your Miles Per Gallon (MPG)

 
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post #1 of 9 (permalink) Old 02-02-2010, 01:58 PM Thread Starter
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How Accurate is Your Mpg?

just bought my cobalt for the gas mileage, i was playing with the mpg screen. i reset when i filled up ran a tank then compared, the dash said i got 32 and doing the math at the pump said i got about 30. i know its pritty close i was just curious if anyone else had checked theres and how far off was it
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post #2 of 9 (permalink) Old 02-02-2010, 02:02 PM
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mine is pretty spot on



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post #3 of 9 (permalink) Old 02-02-2010, 02:29 PM
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It will depend on how you drive. When you are driving if you nail the gas or let up off of it you will notice that the instant mpg monitor takes a few moments to catch up. It's the same with the average mpg monitor for tank to tank results, but to a smaller extent.

If you are always easy on the gas and accelerate/change speeds slowly your average mpg monitor will be +/- less than one mpg.

The accuracy depends on driving style, but yours is about right for normal driving.

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post #4 of 9 (permalink) Old 02-02-2010, 05:29 PM
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It will depend on how you drive. When you are driving if you nail the gas or let up off of it you will notice that the instant mpg monitor takes a few moments to catch up. It's the same with the average mpg monitor for tank to tank results, but to a smaller extent.

If you are always easy on the gas and accelerate/change speeds slowly your average mpg monitor will be +/- less than one mpg.

The accuracy depends on driving style, but yours is about right for normal driving.
hehe this is soo ture.. i can make my car get 10MPG.. if i lay n it real hard all thw way up to the speed limiter...



mods... tinted taillights, 1000 watt alpine mono amp, 2 10 inch alpine type "r" subs, basspro slot ported box, xm radio, alpine 6x9 rear speekers, alpine 6.5 front speekers (both type "s",09SS front bumper and lip,black factory headlights, 12k foglights, 10k headlights, slp catback,fe5 suspension with sportlines,black carpet, painted plastics (black) huge custom pink monster sticker... and ofcourse.... BLACKED OUT!
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post #5 of 9 (permalink) Old 02-02-2010, 05:43 PM
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At 145mph i get 6.5 mpg. Yours sounds about right.


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post #6 of 9 (permalink) Old 02-02-2010, 05:48 PM
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At 145mph i get 6.5 mpg. Yours sounds about right.
lmfao thats awesome. They're pretty acurate. nothing like the ones honda sticks in the fit. I love that car but their off by like 15 mpg. I'd say 2 is pretty close lol
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post #7 of 9 (permalink) Old 03-18-2010, 08:24 PM
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I use the same gas station and pump number whenever possible and always use slow fill and stop at the first click.

Generaly my gas pump math is anywhere from 1.0 mpg lower to 0.5 mpg higher then what my gauge says.

In short, I'd say it's accurate to within 2%.

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post #8 of 9 (permalink) Old 03-19-2010, 09:55 AM
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Mine's usually about 2 MPG lower than what it shows (shows ~37, getting ~35) average over the last three tanks.
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post #9 of 9 (permalink) Old 03-23-2010, 02:34 PM
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About the same with mine 1-2 lower then the DIC is showing.
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