How Far Back Are Data Sampled for Average MPG As Indicated? - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 10 (permalink) Old 04-20-2014, 10:44 PM Thread Starter
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How Far Back Are Data Sampled for Average MPG As Indicated?

I'm wondering if the data that is averaged is sampled continually for the life of the car (or computer) or if there is a moving distance span that is considered in the calculations by the computer. For example, if something affects the mpg greatly in one incident, is it always considered or is that data phased out after so many miles to be replaced by a new set of real time measurements ?
I couldn't find where this has been discussed. If it has and I missed it, I'm sorry. Thanks, Louisiana
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post #2 of 10 (permalink) Old 04-20-2014, 10:58 PM
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I'm pretty sure it keeps track of MPG continually. I don't think it phases out old data. When you reset it, is when it starts over. If you reset it and drove around an averaged 30.4 mpg, and then just let the car sit and idle, your average MPG will continue to keep track and get lower as it sits and burns fuel...

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post #3 of 10 (permalink) Old 04-21-2014, 05:15 AM
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Calculations are done since last reset, so the longer you go without reseting it the closer the reading to your absolute average. Same with average speed, the minute you reset it, it starts over. This will also affect the calculated distance left on the tank.

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post #4 of 10 (permalink) Old 04-21-2014, 06:46 AM
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how do you reset it?
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post #5 of 10 (permalink) Old 04-21-2014, 07:07 AM
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Depending on model and options,press and hold the crooked arrow for 2 seconds on proper display.






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Last edited by Coby7; 04-21-2014 at 07:33 AM.
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post #6 of 10 (permalink) Old 04-21-2014, 08:29 PM
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I like to reset mine on the interstate.
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post #7 of 10 (permalink) Old 04-21-2014, 09:06 PM
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Quote:
Originally Posted by Batmobile View Post
I like to reset mine on the interstate.
99.9 mpg ftw!


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post #8 of 10 (permalink) Old 05-15-2014, 12:37 PM
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I haven't reset mine in a while and I'm at 28.9 mpg ! 2.2 LS mostly gained from highway tho

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post #9 of 10 (permalink) Old 05-18-2014, 03:56 AM
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I've reset mine fumbling around while trying to reset my oil life system display. I guess it would depend on how much you drive but for me within a week or so I'm back within a long term average measure.

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post #10 of 10 (permalink) Old 05-19-2014, 12:57 PM
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Mostly highway, I average 33.20 mpg. last reset of 167 miles was 36.46 mpg. I can live with that!
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